[{"data":1,"prerenderedAt":3444},["ShallowReactive",2],{"all-articles-en":3},[4,920,1481,2173,2684],{"id":5,"title":6,"body":7,"date":902,"description":903,"draft":904,"extension":905,"featuredImage":906,"featuredImageAlt":907,"meta":908,"navigation":909,"originalUrl":910,"path":911,"seo":912,"stem":913,"tags":914,"translationKey":918,"updated":910,"__hash__":919},"articlesEn\u002Fen\u002Farticles\u002Fa-theory-of-consciousness.md","A Theory of Consciousness",{"type":8,"value":9,"toc":876},"minimark",[10,14,22,25,28,31,34,39,42,52,59,62,65,69,72,75,78,81,85,91,94,101,104,107,111,114,117,123,126,129,132,136,142,149,152,155,158,162,165,168,171,174,177,181,184,187,190,193,196,200,203,209,212,215,218,222,225,228,231,234,237,241,247,250,253,256,260,267,270,273,276,279,283,289,292,295,298,308,311,315,318,321,324,327,330,333,337,340,343,346,349,353,359,366,369,372,376,379,382,385,388,391,394,400,403,406,411,414,417,421,431,441,444,447,451,454,457,460,463,466,469,472,475,478,481,484,487,491,494,497,500,503,506,509,512,515,518,521,524,527,530,533,538,544,550,556,562,568,572],[11,12,13],"p",{},"Imagine noticing a spider crawling across your hand. Before you have consciously considered what it is, much of the relevant processing may already have happened. Visual systems have detected and classified features of the animal, learned associations may have activated a threat response, muscles may tense, autonomic state may change, and an impulse to withdraw may already be developing. A moment later, however, the situation can change. You recognise the spider, recall that it is harmless, notice your own fear, remember previous encounters and decide not to follow the immediate impulse. With repeated safe exposure, even that first automatic reaction may eventually diminish.",[11,15,16,17,21],{},"This small example contains much of the puzzle of consciousness. The brain can perceive, classify, predict, evaluate and prepare actions without waiting for conscious deliberation. A substantial amount of sophisticated processing can occur outside awareness.",[18,19,20],"span",{},"1–3"," Yet there are also situations in which leaving those specialised processes to continue on their own appears insufficient. Their outputs may conflict, circumstances may be unfamiliar, a habitual solution may suddenly fail, or information from several domains may have to be combined before the organism can determine what to do. At such moments, something like a higher level of arbitration seems functionally useful.",[11,23,24],{},"This suggests a different way of asking what consciousness is for. Instead of beginning with the mystery of subjective experience, we can begin with a more biological problem: what does a complex organism gain from having a process that can interrupt, compare, coordinate and sometimes override the outputs of systems that normally operate independently?",[11,26,27],{},"The hypothesis developed here is that consciousness is closely associated with precisely that function. It may be the brain’s mechanism for arbitrating situations that cannot adequately be left to automatic processing: novel, conflicting, uncertain or consequential problems that require relevant information from across the brain and body to be brought together into an informed determination of what happens next.",[11,29,30],{},"That arbitration need not depend on a literal central executive somewhere in the brain. It can emerge from distributed processes whose combined activity becomes functionally central because it determines which trajectory governs the organism’s behaviour. Nor does every conscious moment need to culminate in an overt action. Continuing, waiting, redirecting attention, searching memory, reconsidering a goal or maintaining a problem in focus can all count as outcomes of the same broader function.",[11,32,33],{},"What matters is that specialised processes which normally operate with considerable autonomy can, when circumstances demand it, be coordinated around a common focal problem.",[35,36,38],"h3",{"id":37},"a-brain-that-already-knows-how-to-do-things","A brain that already knows how to do things",[11,40,41],{},"It is easy to think about consciousness as the place where cognition happens. Mechanistically, that is almost certainly wrong. The nervous system is massively parallel. Specialised cortical and subcortical systems process visual features, sounds, bodily signals, memories, rewards, threats and possible actions simultaneously, and most of this activity never becomes part of what we can report experiencing.",[11,43,44,45,48,49],{},"Research on unconscious cognition has repeatedly shown that the relevant boundary is not a simple divide between elementary unconscious processing and sophisticated conscious processing. Information outside reported awareness can influence behaviour, response inhibition, conflict processing and some forms of cognitive control.",[18,46,47],{},"2,3"," Likewise, attention, decision-making and integration cannot individually be identified with consciousness, because versions of each can occur without awareness.",[18,50,51],{},"4",[11,53,54,55,58],{},"This creates an important constraint on any functional account. Consciousness cannot simply be what happens when the brain performs a difficult calculation. The more promising distinction concerns how flexibly information can be maintained, combined and reused across contexts. Dehaene and Naccache argued early on that conscious processing is particularly important for durable information maintenance, novel combinations of operations and intentional behaviour.",[18,56,57],{},"1"," Later work has complicated that picture, but the broader contrast remains useful: unconscious processing can be remarkably powerful while tending to be more constrained by the pathways, associations and task structures through which it operates.",[11,60,61],{},"That division of labour is also what an efficient biological system should look like. Most problems ought to be solved automatically whenever possible. A system that consciously reconsidered every muscle movement, every familiar percept and every routine action would be hopelessly inefficient. Specialised processing is fast and parallel precisely because it does not require broad coordination across the entire organism.",[11,63,64],{},"The interesting question begins when that arrangement stops being sufficient.",[35,66,68],{"id":67},"the-arbitration-problem","The arbitration problem",[11,70,71],{},"A flexible organism constantly encounters situations in which different systems favour incompatible outcomes. A threat response promotes withdrawal while explicit knowledge says there is no danger. Immediate reward favours one choice while a long-term objective favours another. A well-learned habit produces a response that was appropriate yesterday but is wrong today. Visual evidence suggests one interpretation while remembered context suggests another.",[11,73,74],{},"Many such conflicts can be resolved locally and automatically. The cases of interest are those in which no existing specialised solution is reliable enough. Relevant information may then have to be drawn from processes that ordinarily serve very different functions: current perception, memory, bodily state, social knowledge, learned values, long-term goals and predictions of future consequences.",[11,76,77],{},"Ultimately, incompatible possibilities must be resolved into coherent behaviour by one organism. This is where the idea of a functional “final say” becomes useful. It does not imply a single anatomical command centre or a hidden observer issuing instructions. It refers to the fact that distributed competition and coordination must eventually produce one effective trajectory: act, wait, continue, stop, investigate, redirect attention or construct another plan.",[11,79,80],{},"The present hypothesis locates the functional value of consciousness close to this process of flexible arbitration. Consciousness becomes especially useful when the organism cannot safely or effectively accept the first answer produced by its specialised machinery.",[35,82,84],{"id":83},"why-consciousness-has-a-focus","Why consciousness has a focus",[11,86,87,88,90],{},"This gives attention a central role, though the term must be used carefully. Attention and consciousness are closely related but not identical. Experimental studies show that some attentional selection can occur without awareness, and neural effects of attention and awareness can sometimes be dissociated.",[18,89,51],{}," The broader word “attention” also covers a range of mechanisms, from local enhancement of sensory processing to deliberate maintenance of a problem in working focus.",[11,92,93],{},"For the present model, the crucial concept is priority. At any moment, enormous numbers of processes could potentially influence the organism, while flexible coordination is limited and comparatively expensive. Some mechanism must determine which problem deserves access to that capacity.",[11,95,96,97,100],{},"Physical intensity is one way to win that competition, but relevance can matter more. A quiet mention of your name can become more important than a loud but irrelevant sound. A stimulus previously associated with reward can continue to capture attention after the reward contingency has disappeared.",[18,98,99],{},"5"," Experience therefore changes what acquires priority.",[11,102,103],{},"This suggests a functional progression in which relevance influences priority, priority establishes focus, focus allows broader integration, and integration enables arbitration. The brain does not implement this as a neat one-directional pipeline; recurrent loops and feedback dominate neural processing. Still, the sequence captures an important logic. Something becomes sufficiently important to interrupt or modify ongoing activity. Attention concentrates limited flexible-processing capacity around the problem. Information relevant to resolving that problem can then constrain the same coordination process, allowing competing possibilities to be evaluated until a course of action emerges.",[11,105,106],{},"From this perspective, the focus of consciousness is not merely a processing limitation. It is part of what makes arbitration possible. Thousands of processes can proceed in parallel, while flexible coordination requires some problem to become temporarily privileged.",[35,108,110],{"id":109},"the-motive-matters","The motive matters",[11,112,113],{},"That immediately raises a deeper question: priority according to what?",[11,115,116],{},"A living system is not a neutral information processor. It has a body whose internal variables must remain within viable ranges. It has needs, capabilities and vulnerabilities. It learns which events predict reward or harm. It develops goals through biology, experience, social learning and culture. In humans, it can eventually represent consequences extending decades into the future.",[11,118,119,120,122],{},"Motivational relevance therefore becomes part of the explanation for why some information acquires attention. Research on value-driven attention provides a clear example. Stimuli associated with reward can later attract attention even when they are no longer useful for the current task.",[18,121,99],{}," Learning has changed the competitive weight of the representation.",[11,124,125],{},"The same principle extends beyond reward. Organisms learn what predicts danger, food, pain, social approval, rejection, opportunity and loss. Humans extend this mechanism still further through abstraction. Money, reputation, examination results, professional status, moral commitments and scientific ideas can all become motivationally significant despite having no innate sensory importance.",[11,127,128],{},"This matters because a system capable of arbitration needs criteria for deciding which outcome is preferable. A perceptual signal does not come with its significance built in. Significance is created by the relationship between the signal, the organism’s history, its current state, its goals and its possible futures.",[11,130,131],{},"The detective’s question—what was the motive?—has a biological analogue. Behaviour becomes intelligible only when we understand why one possible outcome mattered more than another.",[35,133,135],{"id":134},"feeling-is-part-of-the-calculation","Feeling is part of the calculation",[11,137,138,139],{},"The state of the body is an important part of this evaluation. Interoception refers broadly to the sensing and integration of signals originating within the body, involving distributed systems that include brainstem, hypothalamic, insular and cingulate regions. These systems participate in homeostatic regulation, emotion and cognition.",[18,140,141],{},"6,7",[11,143,144,145,148],{},"Different theories disagree about exactly how bodily information contributes to conscious feeling. Damasio and colleagues emphasise the representation of bodily and homeostatic states as foundational to feelings, while predictive-processing approaches describe emotion partly in terms of inference about the causes of interoceptive signals.",[18,146,147],{},"6–8"," The present argument does not depend on choosing one account as complete.",[11,150,151],{},"The important point is that a nervous system continually represents both the external world and the condition of the organism encountering that world. The spider is therefore not processed merely as a visual object. Its representation can interact with learned associations, changes in heart rate, muscle tension, remembered experiences, predicted harm and possible actions.",[11,153,154],{},"This makes feeling functionally relevant to arbitration. Affect can provide information about how strongly a state matters and in what direction. Attention helps determine what deserves priority, while affective and interoceptive processes help determine why it deserves priority for this particular organism.",[11,156,157],{},"That relationship offers a potentially important bridge between function and experience. Conscious states feel significant because the information being coordinated is not abstract in the biological sense. It is coupled to a body, a history of reward and punishment, current needs and predicted consequences.",[35,159,161],{"id":160},"consciousness-works-with-summaries","Consciousness works with summaries",[11,163,164],{},"Despite this sophistication, consciousness has remarkably little access to the computations that generate its contents. When you recognise a familiar person, you do not consciously experience the successive visual operations required to make recognition possible. You simply see Sarah. When unease appears, you may become aware that something is wrong without knowing which cues produced that judgement.",[11,166,167],{},"This is exactly what an efficient coordination architecture would need. Specialised processors do not have to expose their implementation details to every other system. They need to make useful outputs available.",[11,169,170],{},"Conscious processing can therefore operate on compressed representations such as “dangerous,” “familiar,” “I know this,” “I am afraid” or “this matters.” Each may summarise an enormous amount of inaccessible processing. This also helps explain why introspection is often unreliable. Conscious access to a conclusion does not guarantee conscious access to its causal history. The system may receive the outcome and then construct an explanation from whatever information is currently available.",[11,172,173],{},"Sometimes that explanation is accurate. Sometimes it is only plausible.",[11,175,176],{},"This mixture of power and ignorance is a recurring feature of consciousness. We can reason about highly abstract information while remaining almost completely blind to the machinery that produced the representations we are reasoning with.",[35,178,180],{"id":179},"passenger-and-participant","Passenger and participant",[11,182,183],{},"This architecture also makes sense of a familiar duality in conscious experience. Sometimes consciousness appears to be a passenger. An action has begun before deliberate thought, a judgement simply arrives, or a feeling appears without invitation. At other times, conscious processing clearly participates in what happens next. Explicit information changes an action, a remembered rule suppresses a habitual response, deliberation alters a plan, and repeated consciously guided behaviour contributes to later learning.",[11,185,186],{},"These are not necessarily contradictory observations. Consciousness does not need to originate every process in order to influence arbitration among processes. Indeed, if it had to generate every percept, impulse and proposal itself, the efficiency of specialised parallel processing would be lost.",[11,188,189],{},"The spider example again illustrates the point. Automatic threat processing may already have produced a strong withdrawal tendency. Explicit knowledge that the spider is harmless can nevertheless alter what the organism does. Repeated outcomes of that kind can later change the automatic response itself.",[11,191,192],{},"A useful functional cycle therefore emerges: novel or conflicting situations recruit focal coordination; successful resolutions influence behaviour and learning; repeated success allows parts of the solution to become increasingly automatic. When circumstances unexpectedly change, the automated solution can fail and the problem returns to conscious focus.",[11,194,195],{},"Learning, in that sense, often teaches the organism how not to need consciousness for the same problem again.",[35,197,199],{"id":198},"arbitration-needs-a-reference-point","Arbitration needs a reference point",[11,201,202],{},"The argument becomes more interesting when we ask what arbitration is actually for. Possible outcomes can only be evaluated in relation to the organism whose state they affect. The nervous system therefore benefits from maintaining information about its own body, capabilities, current needs, previous experiences, social commitments, goals and possible future states.",[11,204,205,206],{},"At a primitive level, this need does not require anything resembling the adult narrative self. Sensorimotor control already depends on distinctions between self-produced and externally produced events, and research on agency and minimal selfhood suggests roles for multisensory integration, bodily prediction and interoception in generating elementary forms of ownership and agency.",[18,207,208],{},"9,10",[11,210,211],{},"As behaviour becomes more flexible, however, a richer model of the organism becomes useful. Can I reach this object? Am I injured? Have I encountered this before? What am I trying to achieve? What happened the last time I did this? What will happen to me if I choose one option over another?",[11,213,214],{},"The organism becomes one of the most important models used by its own control architecture.",[11,216,217],{},"This offers a functional route toward the self-awareness component of consciousness. Arbitration needs an organism-relative frame of reference. The self-model supplies that frame.",[35,219,221],{"id":220},"the-self-is-not-the-observer","The self is not the observer",[11,223,224],{},"Subjectively, it often feels as though there is an “I” inside the brain observing experiences and making decisions. Mechanistically, that intuition creates an obvious problem: if an inner observer receives conscious information, what observes the observer?",[11,226,227],{},"A self-model offers a different possibility. The self need not be the observer of the coordination process. It can instead be one of the most important representations within it.",[11,229,230],{},"Information is continually evaluated in relation to the organism represented by that model. What is happening to me? What do I know about this? How do I feel? What can I do? What do I want? What will happen if I choose this?",[11,232,233],{},"The first-person perspective of consciousness may partly arise because flexible coordination is organised around this organismic reference point. The system does not first require an independently existing conscious self and then ask what matters to it. Increasingly sophisticated control creates increasing functional value in modelling the organism for which control is being exercised.",[11,235,236],{},"The “I” may therefore be part of the solution to the arbitration problem.",[35,238,240],{"id":239},"from-organism-to-self","From organism to self",[11,242,243,244],{},"This distinction also prevents us from identifying basic consciousness with mature human self-awareness. Infants almost certainly have conscious experiences before possessing anything resembling an adult autobiographical self. Neural studies have identified candidate signatures of conscious perceptual access in infants as young as five months, although transferring adult markers of consciousness to infants remains methodologically difficult and conclusions are strongest when multiple indicators converge.",[18,245,246],{},"11,12",[11,248,249],{},"Self-representation appears to develop in layers rather than appearing all at once. A useful conceptual progression might run from organismic reference to embodied self, agentive self, social self, reflective self and narrative self. These are not meant as rigid developmental stages with precise age boundaries. They distinguish functions that are often collapsed into the single term “self-awareness.”",[11,251,252],{},"The embodied organism can distinguish its own state and actions from the environment. The agentive self represents itself as a source of actions and consequences. The social self represents itself as one agent among others. The reflective self can direct cognition toward its own beliefs, motives and mental states. The narrative self organises these representations across an extended personal history and imagined future.",[11,254,255],{},"Each layer expands what can be included in arbitration.",[35,257,259],{"id":258},"other-minds-enlarge-the-problem","Other minds enlarge the problem",[11,261,262,263,266],{},"Social cognition creates one of the most dramatic expansions. A child gradually learns that other people possess information, beliefs, goals and perspectives that can differ from its own. Classic false-belief research shows a robust developmental progression in explicit understanding that another person can believe something the child knows to be false.",[18,264,265],{},"13"," More complex recursive reasoning continues to develop: I think that she believes that he knows.",[11,268,269],{},"Once other minds become part of the model, the space of possible consequences expands enormously. A decision can depend on what another person believes, what they believe about us, and what we predict they will do as a result. Reputation, trust, deception, obligation, loyalty and cooperation become relevant to behaviour.",[11,271,272],{},"The self-model consequently acquires a social position. The organism no longer represents only “me,” but “me among other selves.”",[11,274,275],{},"That social recursion is likely to be an important part of the unusually elaborate self-awareness characteristic of adult humans.",[11,277,278],{},"Language changes the scale again.",[35,280,282],{"id":281},"language-makes-the-self-explicit","Language makes the self explicit",[11,284,285,286],{},"Basic consciousness does not require language. Infant research alone makes a simple identity between language and consciousness implausible, and neurological evidence shows that aspects of awareness and selfhood can persist despite severe disturbances of language.",[18,287,288],{},"11,12,14",[11,290,291],{},"Language nevertheless gives the arbitration system an extraordinary new capacity. Internal states can become symbolic objects.",[11,293,294],{},"The organism can experience fear. It can then represent that state as “I am afraid.” That representation can itself become the object of attention. The system can ask why it is afraid, whether the fear is justified, whether it wants the fear to control behaviour, and eventually what it means about the kind of person it believes itself to be.",[11,296,297],{},"The output of one round of conscious processing can therefore become the input to another. Experience becomes representation; representation can become linguistic abstraction; abstraction can become a new focus of attention; and the resulting reflection can feed back into further arbitration.",[11,299,300,301,304,305],{},"This recursive loop gives language an important role in human self-awareness without making language the origin of consciousness. Research on inner speech supports roles in planning, self-regulation and self-reflection, while substantial individual variation and evidence of self-awareness without normal inner speech argue strongly against equating the two.",[18,302,303],{},"14–17"," Recent work on language and consciousness likewise suggests that lower-level linguistic processing can occur without awareness, while higher-order semantic integration and reflective thought are more tightly linked to conscious processing.",[18,306,307],{},"18",[11,309,310],{},"Language is therefore better understood as an amplifier of reflective consciousness.",[35,312,314],{"id":313},"the-self-becomes-an-object-in-its-own-world","The self becomes an object in its own world",[11,316,317],{},"Language also allows the self-model to escape the immediate present. “I” can refer to the organism sitting here now, but also to the child I remember being, the person I expect to become, the person another individual believes me to be, or a hypothetical future self decades away.",[11,319,320],{},"This allows present behaviour to be evaluated in relation to a symbolic future organism that does not yet exist. Social language adds roles, reputations, identities and descriptions acquired from other people. The self becomes temporally extended, socially situated and increasingly abstract.",[11,322,323],{},"At sufficient levels of recursion, propositions about the self become ordinary objects of arbitration. I believe this. My belief may be wrong. I want this. Why do I want it? My immediate desire conflicts with another goal. Perhaps I should change the goal. What kind of person do I want to become?",[11,325,326],{},"At this point, the architecture has acquired a striking new property. It was useful to model the organism in order to arbitrate effectively on its behalf. Increasing representational sophistication produced a richer model of that organism. Language made parts of the model explicit and manipulable. Recursive cognition then allowed the model itself to become a problem presented to the same arbitration machinery.",[11,328,329],{},"The “I” became both the reference point of the decision and one of the things about which decisions could be made.",[11,331,332],{},"This may be one reason human consciousness contains such a powerful sense of self-awareness.",[35,334,336],{"id":335},"why-it-feels-like-it-happens-to-me","Why it feels like it happens to me",[11,338,339],{},"This offers a possible bridge between function and phenomenology. Consciousness does not feel like a neutral stream of data. Things happen to me. They matter to me. I experience fear, curiosity, embarrassment, desire, doubt, pain and relief.",[11,341,342],{},"If conscious arbitration integrates information according to its relevance to a model of the organism, that first-person structure is exactly what we should expect. External information is combined with bodily state, memory, motivation and prediction. Possible consequences are evaluated in relation to an organism represented within the system. The self-model supplies the persistent reference around which the problem is organised.",[11,344,345],{},"The experienced “I” therefore need not be an additional entity watching consciousness. It may be the form taken by the organism’s model when that model participates in conscious coordination.",[11,347,348],{},"This does not solve the philosophical hard problem by definition. There remains a legitimate question about why any physical process should possess phenomenal character at all. It does, however, reduce the number of independent mysteries we need to posit. The focus, relative unity, emotional significance, agency and first-person structure of ordinary human consciousness may be mutually related consequences of the same functional architecture.",[35,350,352],{"id":351},"report-comes-later","Report comes later",[11,354,355,356],{},"Language also makes it important to distinguish experience from reporting experience. Traditional consciousness experiments often ask participants to say what they saw, but report requires additional processing: decision, memory, action preparation and often language. No-report paradigms were developed precisely to separate neural processes associated with conscious contents from processes required to describe those contents.",[18,357,358],{},"19",[11,360,361,362,365],{},"These paradigms have limitations of their own. Eliminating an overt response does not guarantee that internal reflection or task-related cognition has disappeared.",[18,363,364],{},"20"," The debate nonetheless reinforces an important point: experience, cognitive access and explicit report are separable enough that they must be distinguished experimentally.",[11,367,368],{},"Within the present model, external report is a downstream capability. Information involved in conscious arbitration can become available to language and deliberate communication without linguistic report being what originally makes the information conscious.",[11,370,371],{},"Human language makes consciousness extraordinarily reportable. That does not mean report creates consciousness.",[35,373,375],{"id":374},"a-working-model","A working model",[11,377,378],{},"The proposed architecture can now be stated more precisely.",[11,380,381],{},"The brain contains many specialised processes capable of sophisticated operation largely autonomously and in parallel. As long as their outputs are reliable and mutually compatible, extensive flexible coordination adds little value. Learned routines can govern behaviour efficiently.",[11,383,384],{},"Certain situations create a different requirement. Something becomes sufficiently novel, conflicting, uncertain or consequential that the existing automatic response is inadequate or should not simply be trusted. Relevance gives the problem priority. Attention establishes a temporary focus. Information needed to address the problem becomes available across otherwise partly independent systems. Perception, memory, bodily state, learned value, current goals, possible actions, social knowledge and predicted consequences can constrain one another.",[11,386,387],{},"The system then arbitrates among the resulting possibilities until a temporary distributed state acquires a functional final say. The phrase does not imply a final neural executive. It means that competing influences have been resolved sufficiently for one trajectory to govern what the organism does next.",[11,389,390],{},"The result can then modify action and learning. Repeated successful solutions can become increasingly automatic, reducing their future requirement for conscious arbitration. Novelty, error or conflict can return them to focal processing.",[11,392,393],{},"A simplified functional sequence therefore looks like this:",[11,395,396],{},[397,398,399],"strong",{},"automatic processing → relevance → priority → focus → integration → arbitration → action → learning → automation",[11,401,402],{},"The self-model occupies a special position because arbitration requires information about the organism for which consequences matter. In humans, social cognition greatly enriches that model. Language then makes parts of it explicit, symbolic and recursively available to the arbitration process itself.",[11,404,405],{},"A second loop emerges:",[11,407,408],{},[397,409,410],{},"experience → self-relevant representation → linguistic abstraction → renewed attention → reflection → revised judgement or goal",[11,412,413],{},"Together, these loops provide a plausible functional account of several properties usually grouped under consciousness. Its focus reflects the need to privilege a problem for flexible arbitration. Its limited capacity reflects the cost of broad coordination compared with parallel specialised processing. Its relative unity reflects the requirement that incompatible possibilities ultimately produce coherent behaviour in one organism. Its emotional character reflects the integration of information with bodily state and learned value. Its agency reflects the ability of coordinated processing to alter which proposal governs behaviour. Its first-person perspective reflects the self-model around which many consequences are organised, while reflective self-awareness is amplified when that model itself becomes available for attention and arbitration.",[11,415,416],{},"The curious mixture of causal influence and introspective ignorance follows from the same architecture. Conscious processing can use the outputs of specialised systems without possessing access to the computations that generated them.",[35,418,420],{"id":419},"how-this-relates-to-existing-theories","How this relates to existing theories",[11,422,423,424,427,428],{},"None of the constituent mechanisms is new. Global Workspace and Global Neuronal Workspace theories emphasise broad availability of conscious information to specialised processors.",[18,425,426],{},"1,21"," Higher-order theories emphasise representations of mental states. Recurrent-processing theories emphasise recurrent neural interactions. Predictive approaches describe perception and action in terms of inference. Attention Schema Theory proposes that the brain constructs simplified models of attention that contribute to awareness and control.",[18,429,430],{},"22",[11,432,433,434,437,438],{},"Contemporary consciousness science has not established a single winner among these theories. A major review in 2022 emphasised both their differences and the difficulty of translating many of their claims into decisive experimental contrasts.",[18,435,436],{},"23"," A large preregistered adversarial collaboration published in 2025 directly tested predictions of Global Neuronal Workspace Theory and Integrated Information Theory and found results that challenged important predictions of both rather than producing a simple victory for either.",[18,439,440],{},"24",[11,442,443],{},"The present proposal can therefore be understood as a functional synthesis rather than a rival claim that one existing theory should be discarded. Global availability may describe how information escapes local specialisation. Attention research helps explain how information acquires priority. Cognitive-control research examines aspects of arbitration. Affective and interoceptive neuroscience investigates how consequences acquire organismic significance. Predictive processing addresses how current information is evaluated against models and possible futures. Research on agency and selfhood examines representations of the organism performing and experiencing actions. Developmental psychology shows how increasingly sophisticated models of other minds and the self emerge. Language research shows how symbolic representation adds recursive and temporally extended forms of self-reflection.",[11,445,446],{},"These may be related because they contribute to a common functional problem: how a living organism determines what matters now and what to do about it when its specialised automatic machinery does not provide a sufficient answer.",[35,448,450],{"id":449},"a-direct-test","A direct test",[11,452,453],{},"The central hypothesis suggests a relatively straightforward experimental strategy. Instead of searching only for neural signatures associated with conscious report, we can manipulate the degree to which a task requires genuine arbitration.",[11,455,456],{},"Participants could receive visual, auditory and contextual information under four conditions. In the simplest condition, one signal directly determines the correct response. A second requires two signals to be integrated. A third creates conflict between signals. In the strongest condition, no source has fixed priority: a changing contextual rule determines which competing source should control behaviour, and novel combinations require application of the rule rather than retrieval of a memorised response.",[11,458,459],{},"The critical information can be manipulated around the threshold of conscious visibility using established masking techniques.",[11,461,462],{},"A second dimension would vary relevance independently of sensory input. Some decisions would have trivial consequences, while others would affect a meaningful reward, loss, current goal or socially relevant outcome.",[11,464,465],{},"The result would be a matrix:",[467,468],"experimental-design-matrix",{},[11,470,471],{},"For each condition, researchers could measure objective performance, subjective visibility, confidence, autonomic responses and neural indicators of local versus broader information availability.",[11,473,474],{},"The hypothesis does not predict that unconscious processing should collapse as soon as information must be integrated. Existing evidence makes that unlikely. The more interesting prediction is that unconscious processing should reach its clearest limits when a task demands genuinely novel, flexible and context-sensitive arbitration among competing information sources.",[11,476,477],{},"Relevance should alter this relationship. Information associated with larger consequences should acquire priority more readily, potentially changing the threshold at which it becomes available for sustained coordination.",[11,479,480],{},"Training provides a further test. With repeated practice, parts of the task should become more automatic and the demand for conscious arbitration should decline. If the rule is suddenly changed, the automated solution should fail and the problem should return to focal conscious processing until a new reliable solution is learned.",[11,482,483],{},"The strongest result against the model would be equally informative. If participants can use genuinely unconscious critical information to identify competing proposals, interpret a novel rule, determine which source should have priority and generalise that arbitration to combinations they have never encountered, then the proposed functional boundary is in the wrong place.",[11,485,486],{},"That would force the model to become more precise.",[35,488,490],{"id":489},"the-puzzle-may-already-be-partly-assembled","The puzzle may already be partly assembled",[11,492,493],{},"An important feature of this hypothesis is that it does not require the discovery of an entirely unknown brain function. Much of the relevant machinery is already being studied in separate scientific traditions.",[11,495,496],{},"Attention researchers ask how information gains priority. Cognitive-control researchers investigate competition and response regulation. Learning researchers ask how effortful behaviour becomes automatic. Affective and interoceptive neuroscience examine how bodily state and value influence cognition. Memory and predictive-processing research investigate how absent past and future events influence present behaviour. Agency research asks how the nervous system represents its own actions and consequences. Developmental psychology studies the construction of models of self and other minds. Language research explores how symbolic representations transform planning and self-regulation. Consciousness research asks which processes distinguish conscious from unconscious information.",[11,498,499],{},"The possibility worth considering is that many of these are pieces of the same architecture viewed from different directions.",[11,501,502],{},"That would change the aim of a useful consciousness theory. The challenge would no longer be only to identify another neural correlate of awareness, but to determine whether established mechanisms can be assembled into a causal explanation of why consciousness has the properties it does.",[11,504,505],{},"Why is conscious processing focused and limited? Why does novelty recruit it? Why does practice make it recede? Why can it override some automatic responses while remaining powerless over others? Why does information in consciousness seem to matter rather than simply exist? Why is experience organised around a self, and why can that self itself become an object of thought? Why does language amplify the phenomenon so dramatically?",[11,507,508],{},"The arbitration hypothesis offers one possible answer. A living system contains many specialised processes that normally function without broad supervision. When their outputs become insufficient, incompatible or important enough to reconsider, limited flexible capacity is concentrated around the problem. Relevant information from across brain and body becomes mutually influential. Possible outcomes are evaluated relative to an organism represented through an increasingly sophisticated self-model. The resulting coordination determines what happens next and can change future automatic behaviour through learning.",[11,510,511],{},"In humans, language transforms the architecture further. The organism can symbolically represent its own states, beliefs, motives, history and possible futures. Those representations can themselves become objects of attention and arbitration. The system can reconsider not only what it should do, but why it wants to do it and whether the goals directing the decision should themselves be changed.",[11,513,514],{},"From the outside, we describe attention, salience, cognitive control, interoception, affect, memory, prediction, learning, agency, language and self-representation. From the inside, something has become important to me, different possibilities compete, relevant knowledge and feelings are brought to bear, and eventually one course of action gains control.",[11,516,517],{},"Perhaps the apparent observer at the centre of this process is not an additional entity waiting to be found. The “I” may be the increasingly sophisticated model of the organism for whose benefit the arbitration is taking place. Our unusually strong human self-awareness may then arise when language allows that model to become explicit, recursive, social and extended through time.",[11,519,520],{},"On this view, consciousness is not merely information becoming globally available. Its functional significance lies in what broad availability makes possible: the capacity to focus the organism’s limited flexible processing on what matters, bring otherwise separate sources of information into a common decision context, and resolve competing possibilities into a coherent response.",[11,522,523],{},"That is a plausible reason for such a mechanism to have enormous evolutionary value. It also offers a plausible explanation for why consciousness has the form we experience: focused, limited, affective, first-personal, sometimes decisive, sometimes merely observant, and capable of turning back upon itself.",[11,525,526],{},"The scientific task is now to see how well the pieces already known from neuroscience and psychology fit this architecture, where the gaps remain, and whether experiments aimed specifically at those gaps support or undermine the model.",[11,528,529],{},"That is a more interesting question than asking where consciousness sits in the brain.",[11,531,532],{},"It asks what consciousness is doing there in the first place.",[534,535,537],"h2",{"id":536},"notes","Notes",[11,539,540,543],{},[397,541,542],{},"1. “Arbitration” is a functional term."," It does not imply a single anatomical decision centre. The hypothesis is compatible with distributed competition, recurrent processing and large-scale network dynamics.",[11,545,546,549],{},[397,547,548],{},"2. “Final say” refers to behavioural outcome, not a literal neural executive."," Competing processes eventually have to produce one effective trajectory for the organism, even if that trajectory is to wait, continue, redirect attention or gather more information.",[11,551,552,555],{},[397,553,554],{},"3. “Automatic” does not mean simple."," Unconscious and automated processes can be highly sophisticated. The proposed distinction concerns flexible, context-sensitive use of information across otherwise partly independent systems.",[11,557,558,561],{},[397,559,560],{},"4. The self-model is not proposed as a prerequisite for all consciousness."," The model distinguishes basic conscious experience from increasingly sophisticated embodied, agentive, social, reflective and narrative forms of self-awareness.",[11,563,564,567],{},[397,565,566],{},"5. Language is treated as an amplifier of reflective self-awareness rather than the origin of consciousness."," It allows internal states and self-representations to become explicit symbolic objects that can be returned to the same process of attention and arbitration.",[534,569,571],{"id":570},"references","References",[573,574,575,593,606,619,632,645,658,671,684,697,710,723,730,743,756,769,782,795,808,821,824,837,850,863],"ol",{},[576,577,578,579,583,584,592],"li",{},"Dehaene, S., & Naccache, L. (2001). Towards a cognitive neuroscience of consciousness: Basic evidence and a workspace framework. ",[580,581,582],"em",{},"Cognition, 79","(1-2), 1-37. ",[585,586,590],"a",{"href":587,"rel":588},"https:\u002F\u002Fdoi.org\u002F10.1016\u002FS0010-0277(00)00123-2",[589],"nofollow",[397,591,587],{},".",[576,594,595,596,599,600,592],{},"van Gaal, S., de Lange, F. P., & Cohen, M. X. (2012). The role of consciousness in cognitive control and decision making. ",[580,597,598],{},"Frontiers in Human Neuroscience, 6",", 121. ",[585,601,604],{"href":602,"rel":603},"https:\u002F\u002Fdoi.org\u002F10.3389\u002Ffnhum.2012.00121",[589],[397,605,602],{},[576,607,608,609,612,613,592],{},"van Gaal, S., Lamme, V. A. F., Fahrenfort, J. J., & Ridderinkhof, K. R. (2011). Dissociable brain mechanisms underlying the conscious and unconscious control of behavior. ",[580,610,611],{},"Journal of Cognitive Neuroscience, 23","(1), 91-105. ",[585,614,617],{"href":615,"rel":616},"https:\u002F\u002Fdoi.org\u002F10.1162\u002Fjocn.2010.21431",[589],[397,618,615],{},[576,620,621,622,625,626,592],{},"Koch, C., & Tsuchiya, N. (2007). Attention and consciousness: Two distinct brain processes. ",[580,623,624],{},"Trends in Cognitive Sciences, 11","(1), 16-22. ",[585,627,630],{"href":628,"rel":629},"https:\u002F\u002Fdoi.org\u002F10.1016\u002Fj.tics.2006.10.012",[589],[397,631,628],{},[576,633,634,635,638,639,592],{},"Anderson, B. A., Laurent, P. A., & Yantis, S. (2011). Value-driven attentional capture. ",[580,636,637],{},"Proceedings of the National Academy of Sciences, 108","(25), 10367-10371. ",[585,640,643],{"href":641,"rel":642},"https:\u002F\u002Fdoi.org\u002F10.1073\u002Fpnas.1104047108",[589],[397,644,641],{},[576,646,647,648,651,652,592],{},"Damasio, A., & Carvalho, G. B. (2013). The nature of feelings: Evolutionary and neurobiological origins. ",[580,649,650],{},"Nature Reviews Neuroscience, 14",", 143-152. ",[585,653,656],{"href":654,"rel":655},"https:\u002F\u002Fdoi.org\u002F10.1038\u002Fnrn3403",[589],[397,657,654],{},[576,659,660,661,664,665,592],{},"Carvalho, G. B., & Damasio, A. (2021). Interoception and the origin of feelings: A new synthesis. ",[580,662,663],{},"BioEssays, 43","(6), e2000261. ",[585,666,669],{"href":667,"rel":668},"https:\u002F\u002Fdoi.org\u002F10.1002\u002Fbies.202000261",[589],[397,670,667],{},[576,672,673,674,677,678,592],{},"Seth, A. K., & Critchley, H. D. (2013). Extending predictive processing to the body: Emotion as interoceptive inference. ",[580,675,676],{},"Behavioral and Brain Sciences, 36","(3), 227-228. ",[585,679,682],{"href":680,"rel":681},"https:\u002F\u002Fdoi.org\u002F10.1017\u002FS0140525X12002270",[589],[397,683,680],{},[576,685,686,687,690,691,592],{},"Limanowski, J., & Blankenburg, F. (2013). Minimal self-models and the free energy principle. ",[580,688,689],{},"Frontiers in Human Neuroscience, 7",", 547. ",[585,692,695],{"href":693,"rel":694},"https:\u002F\u002Fdoi.org\u002F10.3389\u002Ffnhum.2013.00547",[589],[397,696,693],{},[576,698,699,700,703,704,592],{},"Seth, A. K., & Tsakiris, M. (2018). Being a beast machine: The somatic basis of selfhood. ",[580,701,702],{},"Trends in Cognitive Sciences, 22","(11), 969-981. ",[585,705,708],{"href":706,"rel":707},"https:\u002F\u002Fdoi.org\u002F10.1016\u002Fj.tics.2018.08.008",[589],[397,709,706],{},[576,711,712,713,716,717,592],{},"Kouider, S., Stahlhut, C., Gelskov, S. V., Barbosa, L. S., Dutat, M., de Gardelle, V., Christophe, A., Dehaene, S., & Dehaene-Lambertz, G. (2013). A neural marker of perceptual consciousness in infants. ",[580,714,715],{},"Science, 340","(6130), 376-380. ",[585,718,721],{"href":719,"rel":720},"https:\u002F\u002Fdoi.org\u002F10.1126\u002Fscience.1232509",[589],[397,722,719],{},[576,724,725,726,729],{},"Bayne, T., Seth, A. K., Massimini, M., Shepherd, J., Cleeremans, A., Fleming, S. M., Malach, R., Mattingley, J. B., Menon, D. K., Owen, A. M., Peters, M. A. K., Razi, A., & Mudrik, L. (2024). Tests for consciousness in humans and beyond. ",[580,727,728],{},"Trends in Cognitive Sciences",". See also the 2024 literature on cluster-based approaches to infant consciousness.",[576,731,732,733,736,737,592],{},"Wellman, H. M., Cross, D., & Watson, J. (2001). Meta-analysis of theory-of-mind development: The truth about false belief. ",[580,734,735],{},"Child Development, 72","(3), 655-684. ",[585,738,741],{"href":739,"rel":740},"https:\u002F\u002Fdoi.org\u002F10.1111\u002F1467-8624.00304",[589],[397,742,739],{},[576,744,745,746,749,750,592],{},"Mitchell, R. W. (2009). Self-awareness without inner speech: A commentary on Morin. ",[580,747,748],{},"Consciousness and Cognition, 18","(2), 532-534. ",[585,751,754],{"href":752,"rel":753},"https:\u002F\u002Fdoi.org\u002F10.1016\u002Fj.concog.2008.12.003",[589],[397,755,752],{},[576,757,758,759,762,763,592],{},"Perrone-Bertolotti, M., Rapin, L., Lachaux, J.-P., Baciu, M., & Lœvenbruck, H. (2014). What is that little voice inside my head? Inner speech phenomenology, its role in cognitive performance, and its relation to self-monitoring. ",[580,760,761],{},"Behavioural Brain Research, 261",", 220-239. ",[585,764,767],{"href":765,"rel":766},"https:\u002F\u002Fdoi.org\u002F10.1016\u002Fj.bbr.2013.12.034",[589],[397,768,765],{},[576,770,771,772,775,776,592],{},"Alderson-Day, B., & Fernyhough, C. (2015). Inner speech: Development, cognitive functions, phenomenology, and neurobiology. ",[580,773,774],{},"Psychological Bulletin, 141","(5), 931-965. ",[585,777,780],{"href":778,"rel":779},"https:\u002F\u002Fdoi.org\u002F10.1037\u002Fbul0000021",[589],[397,781,778],{},[576,783,784,785,788,789,592],{},"Fernyhough, C., & Borghi, A. M. (2023). Inner speech as language process and cognitive tool. ",[580,786,787],{},"Trends in Cognitive Sciences, 27","(12), 1180-1193. ",[585,790,793],{"href":791,"rel":792},"https:\u002F\u002Fdoi.org\u002F10.1016\u002Fj.tics.2023.08.014",[589],[397,794,791],{},[576,796,797,798,801,802,592],{},"Aubinet, C., Gosseries, O., & Majerus, S. (2026). The interaction between language and consciousness. ",[580,799,800],{},"Neuroscience & Biobehavioral Reviews, 180",", 106498. ",[585,803,806],{"href":804,"rel":805},"https:\u002F\u002Fdoi.org\u002F10.1016\u002Fj.neubiorev.2025.106498",[589],[397,807,804],{},[576,809,810,811,814,815,592],{},"Tsuchiya, N., Wilke, M., Frässle, S., & Lamme, V. A. F. (2015). No-report paradigms: Extracting the true neural correlates of consciousness. ",[580,812,813],{},"Trends in Cognitive Sciences, 19","(12), 757-770. ",[585,816,819],{"href":817,"rel":818},"https:\u002F\u002Fdoi.org\u002F10.1016\u002Fj.tics.2015.10.002",[589],[397,820,817],{},[576,822,823],{},"Duman, I., et al. (2022). The limits of no-report paradigms in consciousness research. PMID 35634201.",[576,825,826,827,830,831,592],{},"Mashour, G. A., Roelfsema, P., Changeux, J.-P., & Dehaene, S. (2020). Conscious processing and the Global Neuronal Workspace hypothesis. ",[580,828,829],{},"Neuron, 105","(5), 776-798. ",[585,832,835],{"href":833,"rel":834},"https:\u002F\u002Fdoi.org\u002F10.1016\u002Fj.neuron.2020.01.026",[589],[397,836,833],{},[576,838,839,840,843,844,592],{},"Graziano, M. S. A., & Webb, T. W. (2015). The attention schema theory: A mechanistic account of subjective awareness. ",[580,841,842],{},"Frontiers in Psychology, 6",", 500. ",[585,845,848],{"href":846,"rel":847},"https:\u002F\u002Fdoi.org\u002F10.3389\u002Ffpsyg.2015.00500",[589],[397,849,846],{},[576,851,852,853,856,857,592],{},"Seth, A. K., & Bayne, T. (2022). Theories of consciousness. ",[580,854,855],{},"Nature Reviews Neuroscience, 23",", 439-452. ",[585,858,861],{"href":859,"rel":860},"https:\u002F\u002Fdoi.org\u002F10.1038\u002Fs41583-022-00587-4",[589],[397,862,859],{},[576,864,865,866,869,870,592],{},"Cogitate Consortium et al. (2025). Adversarial testing of global neuronal workspace and integrated information theories of consciousness. ",[580,867,868],{},"Nature",". ",[585,871,874],{"href":872,"rel":873},"https:\u002F\u002Fdoi.org\u002F10.1038\u002Fs41586-025-08888-1",[589],[397,875,872],{},{"title":877,"searchDepth":878,"depth":878,"links":879},"",2,[880,882,883,884,885,886,887,888,889,890,891,892,893,894,895,896,897,898,899,900,901],{"id":37,"depth":881,"text":38},3,{"id":67,"depth":881,"text":68},{"id":83,"depth":881,"text":84},{"id":109,"depth":881,"text":110},{"id":134,"depth":881,"text":135},{"id":160,"depth":881,"text":161},{"id":179,"depth":881,"text":180},{"id":198,"depth":881,"text":199},{"id":220,"depth":881,"text":221},{"id":239,"depth":881,"text":240},{"id":258,"depth":881,"text":259},{"id":281,"depth":881,"text":282},{"id":313,"depth":881,"text":314},{"id":335,"depth":881,"text":336},{"id":351,"depth":881,"text":352},{"id":374,"depth":881,"text":375},{"id":419,"depth":881,"text":420},{"id":449,"depth":881,"text":450},{"id":489,"depth":881,"text":490},{"id":536,"depth":878,"text":537},{"id":570,"depth":878,"text":571},"2026-09-10","A functional hypothesis in which consciousness helps arbitrate novel, conflicting, uncertain or consequential problems across brain and body.",false,"md","\u002Fimages\u002Fartikelen\u002Fa-theory-of-consciousness\u002Fconsciousness-arbitration.webp","A human profile merging neural networks and memories with a social world at sunset",{},true,null,"\u002Fen\u002Farticles\u002Fa-theory-of-consciousness",{"title":6,"description":903},"en\u002Farticles\u002Fa-theory-of-consciousness",[915,916,917],"Consciousness","Neuroscience","Philosophy","theory-of-consciousness","L0Q_5U3BpbDLoLdB_eldlvXjeSe3Jmi7estdgmE1I2s",{"id":921,"title":922,"body":923,"date":902,"description":1468,"draft":904,"extension":905,"featuredImage":1469,"featuredImageAlt":1470,"meta":1471,"navigation":909,"originalUrl":910,"path":1472,"seo":1473,"stem":1474,"tags":1475,"translationKey":1479,"updated":910,"__hash__":1480},"articlesEn\u002Fen\u002Farticles\u002Fargentine-tango-a-conversation-between-two-bodies.md","Argentine Tango: A Conversation Between Two Bodies",{"type":8,"value":924,"toc":1452},[925,935,938,941,960,971,974,981,984,988,991,994,1005,1008,1011,1015,1026,1029,1039,1042,1045,1048,1055,1058,1063,1066,1070,1073,1076,1079,1086,1089,1092,1096,1099,1102,1105,1111,1115,1126,1133,1136,1140,1146,1149,1152,1155,1158,1164,1167,1171,1177,1180,1183,1186,1189,1192,1199,1205,1208,1215,1219,1222,1225,1231,1234,1237,1240,1244,1247,1250,1253,1260,1264,1267,1270,1273,1276,1286,1289,1293,1296,1299,1302,1309,1312,1319,1322,1325,1329,1340,1343,1346,1353,1356,1359,1363,1366,1369,1375,1378,1381,1384,1387,1390,1394,1397,1416,1434],[11,926,927,928],{},"Video example: ",[585,929,932],{"href":930,"rel":931},"https:\u002F\u002Fyoutube.com\u002Fshorts\u002F3xpDPokkd7U?si=uBSr5XC5UB__LxfC",[589],[397,933,934],{},"Valseando with a sense of freedom",[11,936,937],{},"In tango, we often speak of leaders and followers. But during a giro, for example, something can happen that does not fit comfortably into the simple description of one dancer leading and the other following. In the video above, at one point the dancers let go of each other and one begins to move around the other. The other responds independently, alternately turning towards and away from their partner. One dances the short accents of the rhythm section while the other follows the longer movements of, say, a violin line. They are dancing together, but they are not saying exactly the same thing. And yet, together, they express the music—perhaps even more fully than if they were doing the same thing.",[11,939,940],{},"A large part of the attraction of Argentine tango, and of dancing together in general, lies in precisely that freedom, in this physical conversation. Two people can create a complex dance together without choreography, sometimes without ever having met before. They do not know what movement will happen five seconds from now. Often they do not know one second in advance. And yet they can walk, turn, accelerate, slow down and stop without the dance falling apart.",[11,942,943,944,947,948,951,952,955,956,959],{},"When we hold each other in an ",[580,945,946],{},"abrazo",", as the embrace in Argentine tango is called, we usually call the two traditional roles ",[580,949,950],{},"leader"," and ",[580,953,954],{},"follower",". This is understandable and practical. At a traditional milonga, dancing in the ",[580,957,958],{},"ronda",", there is someone primarily responsible for maintaining the line of dance, watching the space ahead and initiating new movements. But those words can also tempt us into a division of roles in which, eventually, all initiative resides with the leader and the follower is mainly allowed to... follow.",[11,961,962,963,966,967,970],{},"As with some other social patterns, once we become deeply accustomed to this, it can be difficult to escape. You can see this even within tango as it is already danced today. We often have to relearn that the person who initiates a movement does not determine everything that happens afterwards. The other dancer can, may, and at certain moments ",[580,964,965],{},"must"," make their own choices about timing and movement. The leader has to take into account not only the physical space the follower needs in order to move at all, but also the speed at which that happens, delays, embellishments, and the deliberate continuation of a movement for just a little longer. Good tango should therefore never become a physical version of ",[580,968,969],{},"Simon Says",", in which one body gives instructions and the other obeys them as accurately as possible.",[11,972,973],{},"And yet there remains a genuine asymmetry in traditional tango. Usually the same person is expected to propose each new direction. The other has considerable freedom within whatever emerges from that—certainly compared with many other partner dances—but rarely opens a new branch of the dance themselves.",[11,975,976,977,980],{},"Could we change precisely that? Could the language tango has developed over more than a century—walking, sensing weight, turning, opening space, feeling one another through the torso, listening to music and constantly improvising—also be one of the richest starting points for ",[397,978,979],{},"dancing freely together","?",[11,982,983],{},"To find out, we first need to understand a little better what leading and following actually consist of, which differences between the dancers are genuinely necessary or useful, and how initiative might pass from one dancer to the other without losing tango's clarity. Preferably without continually having to reverse the entire role, including who occupies which side of the abrazo.",[35,985,987],{"id":986},"a-dance-nobody-designed","A dance nobody designed",[11,989,990],{},"First, a little history. Tango was not invented by anyone. The dance emerged towards the end of the nineteenth century in Buenos Aires and Montevideo, in an urban world where European immigrants, criollo cultures and Afro-Rioplatense communities encountered one another. Music and movement from different traditions became intertwined and changed along the way.",[11,992,993],{},"There is a familiar story that men mainly learned tango with other men because Buenos Aires had far more men than women. This is not entirely invented. There were indeed large groups of male immigrants, and photographs and descriptions exist of men dancing tango together. But there is no evidence, in that simple form, that tango originated as a men's dance, or that men practised exclusively with other men so they could later dance with women.",[11,995,996,997,1000,1001,1004],{},"For our purposes, something else is more interesting: men ",[580,998,999],{},"did"," dance with men. That alone makes it clear that the two technical roles cannot have depended on a male and a female body. The later association of ",[580,1002,1003],{},"man leads, woman follows"," is a social tradition, not a natural law of movement.",[11,1006,1007],{},"The movement language itself also changed continuously. Early descriptions contain movements we still know today alongside all sorts of things that later disappeared. Tango was not a system that was first designed and then had to be performed correctly. Dancers found solutions, copied them from one another, changed them, and allowed others to disappear.",[11,1009,1010],{},"At the heart of tango—and of what makes the dance so attractive to many dancers, myself included—is the way we can improvise together. And that is possible partly because tango has developed a relatively clear physical language for doing so.",[35,1012,1014],{"id":1013},"not-knowing-what-comes-next","Not knowing what comes next",[11,1016,1017,1018,1021,1022,1025],{},"Argentine tango has a remarkable quality: almost nothing about the next step has to be predetermined. Beginners often learn a ",[580,1019,1020],{},"salida básica",", but this is not a cycle to which the dance constantly has to return. The term that perhaps describes the real foundation better is ",[580,1023,1024],{},"el caminar",": walking.",[11,1027,1028],{},"Two dancers can express an entire tango with little more than walking together. Preferably with a little more attention and panache than when shuffling off to the supermarket, but even within that simple act of walking lies an enormous range of possibilities. As an improvising musician, this was one of the things that immediately made my heart beat faster.",[11,1030,1031,1032,1035,1036,592],{},"Tango is, of course, much more than walking. After one step there may be another step, but there could also be an ocho, a giro, a parada, a cross, or something completely different. Even ",[580,1033,1034],{},"when"," the next step or movement happens is not fixed. You can step on every beat, use double time, slow down, follow a melody or remain still while the orchestra continues. You can even initiate a step and not complete it, as in an ",[580,1037,1038],{},"amague",[11,1040,1041],{},"Rather than learning the dance only as a collection of steps that can be strung together, we can therefore see it as a continuously changing situation in which we use a toolbox of techniques. At every moment, two bodies occupy particular positions in relation to each other. The weight is here, the free leg there, the torsos are at a certain angle, there is a certain distance between them, and perhaps some movement or rotation remains from what has just happened.",[11,1043,1044],{},"From that situation, some things are easily possible and others are not. One movement changes the situation, and with it what can happen next.",[11,1046,1047],{},"Researchers such as Michael Kimmel describe something similar when they write about the possibilities experienced dancers recognise in a situation while dancing. Recent research into the geometry of tango likewise shows how strongly the dancers' positions and weight distribution determine which movements subsequently become available.",[11,1049,1050,1051,1054],{},"An experienced dancer therefore does not simply know many figures. They become increasingly good at seeing and feeling ",[397,1052,1053],{},"what can happen from here",". And there is another layer: not everything that is possible is also a good idea at that particular moment. A large turn may be technically possible when there is hardly any room behind you. A sacada may fit geometrically but become uncomfortable because of the size of the step. A movement may be technically perfect and still say absolutely nothing about the music playing at that moment.",[11,1056,1057],{},"Again and again, this produces a simple process:",[11,1059,1060],{},[397,1061,1062],{},"state → possibilities → preferences → new state.",[11,1064,1065],{},"To me, that is a much more interesting basis for improvisation than a catalogue of figures.",[35,1067,1069],{"id":1068},"the-music-helps-us-choose","The music helps us choose",[11,1071,1072],{},"Music plays a much larger role in this than merely telling us when to move. A sharp rhythm from bandoneons or piano makes different movements attractive than a long violin line. A sudden silence may invite us to do absolutely nothing. A melody that builds tension over several bars may give us reason to let a movement continue for longer.",[11,1074,1075],{},"The more tango you dance and listen to, the more you learn to feel these relationships. As a musician, I may have become consciously aware of them a little sooner. Certain rhythms almost automatically evoke a particular subset of all possible movements for me. Not because the music dictates exactly which movement I should make, but because some possibilities simply feel much more logical and attractive at that moment than others.",[11,1077,1078],{},"The music therefore does not enter the picture only after we have decided what to do. It changes the landscape from which we choose.",[11,1080,1081,1082,1085],{},"And both dancers hear the same music. That does not mean they hear the same ",[580,1083,1084],{},"thing",". One may be absorbed in the rhythm while the other follows a melodic countervoice. That is precisely where tango can become beautiful. Two bodies do not have to keep saying the same thing about the music. As long as their movements are compatible, they can express different voices.",[11,1087,1088],{},"That is also one reason tango works surprisingly well with many different kinds of music. Classical tango music can be extraordinarily rich in rhythm, melody, countermelody, phrasing and contrast between instruments. Much non-tango music is simpler in those respects, something traditionally minded tango dancers sometimes rightly find less musically interesting. Modern music, on the other hand, can be much richer in sound, bass, stereo image, texture and the physical impact of good production. Tango does not prescribe which of those qualities we have to dance, and can therefore handle a surprising range of music. At some milongas you can see this reflected directly: classical, neo- and non-tango alternate throughout the evening.",[11,1090,1091],{},"Music also helps the dancers communicate. The end of a phrase, a silence, a strong accent or a change of instrumentation is heard by both. Such moments become natural places for a movement idea to end, continue or make way for something else. Music is therefore not merely decoration. It is almost a third participant in the conversation.",[35,1093,1095],{"id":1094},"traditional-tango-already-has-two-voices","Traditional tango already has two voices",[11,1097,1098],{},"We do not need to dismantle the existing dance before we can make tango more reciprocal. Much of what we need is already there. Take an ocho. One dancer may initiate the movement, but that by no means determines everything that follows. The other organises their own axis, makes the pivot and ultimately takes the step themselves. The actual size of that step and the time the movement takes become part of what the first dancer subsequently has to feel.",[11,1100,1101],{},"This becomes even clearer in a giro. One dancer can initiate the turn while the other steps around them. But the outside dancer takes real steps, with a real length and speed. Those steps determine the actual radius and tempo of the giro. The dancer in the centre cannot completely dictate this in advance and has to keep listening to what is actually happening.",[11,1103,1104],{},"At a high level, you regularly see movements that beginners strongly associate with one role being used in both directions. Men or traditional leaders make ochos themselves, move around their partner, or are turned in a planeo by the traditional follower. Sometimes the roles visibly switch, but often something subtler happens: the basic roles remain recognisable while one particular function moves to the other side for a few beats.",[11,1106,1107,1108,592],{},"Within a movement initiated by the other person, the second dancer also has room to retain a musical voice of their own. A step can be placed softly or sharply. A pivot can have its own phrasing. A free foot can draw the music. A movement can be small and rhythmic or expansive and flowing, as long as it fits what the two bodies are doing together. This is an important distinction: ",[397,1109,1110],{},"having a voice of your own is not the same as taking a new initiative",[35,1112,1114],{"id":1113},"proposal-uptake-and-division-of-tasks","Proposal, uptake and division of tasks",[11,1116,1117,1118,1121,1122,1125],{},"So traditional tango has long contained that second voice. But what we want to investigate is what happens when the conversation becomes genuinely reciprocal. A new initiative begins with a ",[397,1119,1120],{},"proposal",". One dancer uses their body to make a new possibility perceptible. The other feels that proposal and can ",[397,1123,1124],{},"take it up",". Only after that uptake does it become something they are going to do together.",[11,1127,1128,1129,1132],{},"A temporary ",[397,1130,1131],{},"division of tasks"," then emerges. In an ocho, the person proposing the movement has different tasks from the person executing the ocho. In a giro, the division is different again. One dancer may be responsible for opening and maintaining a direction or rotation, while the other organises their own balance, pivot, step and actual arrival. These are not higher and lower tasks. They are different parts of the same shared movement.",[11,1134,1135],{},"Much of the intelligence tango has accumulated over its development resides precisely in these divisions of tasks. Not every asymmetry is a problem we need to solve. Two bodies cannot occupy the same place, and many movements work precisely because each dancer temporarily does something different.",[35,1137,1139],{"id":1138},"and-then-there-are-embellishments","And then there are embellishments",[11,1141,1142,1143,592],{},"Alongside what is necessary to execute the shared movement, there is another kind of freedom: the embellishment, or ",[580,1144,1145],{},"adorno",[11,1147,1148],{},"An embellishment is optional. The movement works without it. A free foot can draw something extra, a rhythmic detail can be added, a leg can trace a different line. Such an embellishment often arises directly from something the dancer hears in the music.",[11,1150,1151],{},"The important difference is that the partner does not have to respond to it.",[11,1153,1154],{},"Some things I do are necessary for my part of our shared movement. Other things I do because I want to express my own voice within that movement. Neither automatically means that I am now asking something new of you.",[11,1156,1157],{},"That distinction becomes important as soon as both dancers are allowed to propose new initiatives themselves. Otherwise the dance becomes restless. If every small variation or embellishment is interpreted by the partner as a new invitation, both bodies will constantly respond to messages that were never intended as messages.",[11,1159,1160,1161,592],{},"Listening well, then, does not mean reacting to everything. Listening well means being able to feel ",[397,1162,1163],{},"what requires a response and what you can simply allow the other person to do",[11,1165,1166],{},"That may initially seem like a minor detail, but I think it is one of the conditions for making reciprocal tango not only freer but genuinely pleasant to dance.",[35,1168,1170],{"id":1169},"a-new-proposal","A new proposal",[11,1172,1173,1174,592],{},"The interesting question, therefore, is not how we can make everything symmetrical, but ",[397,1175,1176],{},"which asymmetries help the movement and which we have retained merely because traditionally the same person is always the leader or follower",[11,1178,1179],{},"This becomes even more interesting because the abrazo itself is asymmetrical. The two arms have different functions. The arm around the back may need to slide further around during a turn or, conversely, make more room. The torsos are not always positioned exactly opposite one another. As a result, a movement that appears easy to mirror on paper may require a different practical execution on the other side.",[11,1181,1182],{},"Equality therefore does not mean both people have to do everything identically. It means both people have access to the same possibilities and principles, while the actual division of tasks can take account of the positions their bodies really occupy.",[11,1184,1185],{},"Suppose we look at it this way: during a movement, the dancer who did not initiate it can begin proposing something new. How do we begin that conversation?",[11,1187,1188],{},"Imagine A has proposed a giro and B has taken it up. While the giro is happening, B does all sorts of things that are simply part of their task. B may also embellish. A does not need to interpret any of this as a new initiative.",[11,1190,1191],{},"But B can also do something with a different intention. B can make a possibility perceptible for what might happen next. Perhaps a certain rotation is deliberately maintained. Perhaps the orientation of the torso changes in a way that is not required for the current movement. Perhaps a small projection develops in a new direction. Or perhaps B simply wants the existing movement to continue for longer than A originally had in mind.",[11,1193,1194,1195,1198],{},"For the purposes of communication, it does not matter very much whether this extends the previous idea or introduces something entirely new. In both cases the same thing happens: ",[397,1196,1197],{},"B makes a proposal",". That proposal is not yet a movement that A has to execute.",[11,1200,1201,1202,592],{},"This seems to me an important principle for reciprocal tango: ",[397,1203,1204],{},"a new initiative is first offered, and only becomes a shared movement after it has been taken up",[11,1206,1207],{},"That means initiative does not have to be fought over. I do not have to physically pull you in the direction I have imagined. I only need to provide enough information for you to feel that a possibility is there. If you take it up, we can develop it together. If you do not, I can let it disappear again, either by doing nothing or by continuing to move with your proposals.",[11,1209,1210,1211,1214],{},"A proposal can also appear gradually. While you are still finishing a phrase, I can already allow something small to emerge that might become what happens next. As an improvising musician, that feels familiar. Near the end of another musician's solo or phrase, you can cautiously add a few notes. Not to say, ",[580,1212,1213],{},"stop, it's my turn now",", but to make a possible next direction audible. The other person can make room for it, respond to it, or continue for a little longer.",[35,1216,1218],{"id":1217},"tango-as-an-ideal-basis-for-dancing-freely-together","Tango as an ideal basis for dancing freely together",[11,1220,1221],{},"Tango possesses a remarkable combination of qualities. The dance has developed a sophisticated language for weight, axis, direction, rotation and distance. The abrazo provides continuous information about the other person's body. No fixed choreography is required. Stillness is allowed. The music can be interpreted rhythmically, melodically and dynamically in many different ways. Movement can remain small enough to function among dozens of other couples and at the same time become enormously rich technically.",[11,1223,1224],{},"Above all, tango has more than a century of experience with a rather complicated problem: how can two people move together when almost nothing about the next movement has been determined?",[11,1226,1227,1228,592],{},"That makes tango, for me, not just a beautiful dance but potentially one of the best ",[397,1229,1230],{},"foundations for dancing freely together",[11,1232,1233],{},"Contact improvisation explores some of the same territory from a different history and with different possibilities, for example by going much further in shared weight, floorwork and changing orientations. Other partner dances have found other solutions. But tango has something special in its combination of continuous contact, clear physical language, improvisation and applicability to many different kinds of music.",[11,1235,1236],{},"If everyone learns the entire language from the beginning, something emerges that goes beyond simply “being able to lead and follow”. You learn how to make a physical proposal without forcing another person. You learn how to take up a movement without becoming passive. You learn which parts of a shared movement are your responsibility, where you can play freely without asking anything of the other person, and how to communicate that you yourself see a new possibility. It also creates much more freedom for dancers of different experience levels to find their own balance, something that can have a major influence in a more traditional division of roles but here leaves much more room for that balance to emerge naturally.",[11,1238,1239],{},"You also learn to let go of a proposal. That may be just as important as learning to take initiative well. Dancing freely together can only work if neither person needs their idea to win. Tango already has a wonderful tool for this: we can always do nothing for a moment.",[35,1241,1243],{"id":1242},"an-etiquette-within-and-beyond-the-abrazo","An etiquette within and beyond the abrazo",[11,1245,1246],{},"That contact gives us an extraordinarily rich channel of communication. Through the abrazo we feel weight, projection, rotation, direction, tension and relaxation. We feel whether a body is arriving or wants to continue. Often, even before a step, we can already feel which possibility is being prepared. But we also follow each other without an abrazo: we remain oriented towards one another, usually with the whole upper body, sometimes briefly with the face alone.",[11,1248,1249],{},"It therefore seems unnecessary to invent an entirely new system of gestures for reciprocal tango. Preferably not, in fact. A kind of Morse code in which a particular shoulder movement always means “I'm taking over now” would probably make the dance poorer rather than richer.",[11,1251,1252],{},"It is more interesting to investigate what information existing tango technique already contains and how we can make it legible in both directions. One particularly interesting moment is the end of a movement. Often both bodies arrive in a state from which many possibilities are available again. But the dancer who has mainly been executing a received movement can also deliberately choose not to return completely to the most neutral position. A certain torsion may remain, a projection may become perceptible, the connection may indicate that something is still continuing.",[11,1254,1255,1256,1259],{},"That can become an invitation: ",[580,1257,1258],{},"follow what I see here."," For this to work reliably, we need a few simple conventions. A movement that already clearly contains weight or momentum takes precedence over a new proposal that conflicts with it. A proposal begins small enough not to be forced. Whoever proposes something gives the other person room either to take it up or not. Once it has been taken up, both dancers respect the division of tasks belonging to the movement that has emerged. And if two things happen at once and neither dancer is quite sure what the other means, nobody has to win. Slowing down or standing still is still perfectly good tango.",[35,1261,1263],{"id":1262},"equality-does-not-require-simultaneity","Equality does not require simultaneity",[11,1265,1266],{},"One obvious objection to dancing without a fixed leader is this: if both dancers are allowed to choose, what happens when they want different things at the same time?",[11,1268,1269],{},"The traditional division of roles solves this problem simply. One person is given the default initiative to choose the next shared path. But we are looking for a conversation in which both dancers may make proposals, a conversation on the dance floor in which neither has to dominate.",[11,1271,1272],{},"After all, two people can participate in a conversation as complete equals. Usually only one of them speaks at a time, but that does not make it a long monologue. We have learned all sorts of subtle ways of signalling that we are continuing, finishing, wanting to add something or giving someone else room. Sometimes we briefly speak over each other and one of us naturally makes space.",[11,1274,1275],{},"Jazz works in a similar way. A saxophonist may be playing a solo while the drummer, bassist and pianist are anything but passive. They continuously make decisions within their own tasks and can strongly influence the musical character. Sometimes an idea from the drummer or bassist creates a new direction that the entire group adopts. Nobody needs to establish formally at every bar who the leader is.",[11,1277,1278,1279,951,1282,1285],{},"That distinction is useful in tango as well. There can be a difference between ",[397,1280,1281],{},"initiative",[397,1283,1284],{},"direction",". I may have considerable influence over the overall direction of the dance for an entire musical phrase while you retain a pronounced voice of your own within it. Meanwhile, you can make a small new proposal without immediately taking over all direction. If I go with it, that direction can gradually shift towards you.",[11,1287,1288],{},"Equality therefore does not require simultaneity, nor does it require bookkeeping in which we check every eight beats whether both dancers have had exactly the same amount of influence. The freedom lies in both being allowed to speak and both having learned how to listen.",[35,1290,1292],{"id":1291},"everyone-learns-the-whole-language","Everyone learns the whole language",[11,1294,1295],{},"If we want to move in this direction, it also has consequences for how tango is taught. Everyone could learn the same movement principles from the beginning: walking, pivoting, making forward and backward ochos, moving around the partner, being the centre of a turn, opening and occupying space, making proposals and taking them up.",[11,1297,1298],{},"That does not mean beginners should immediately try to do everything at once. Quite the opposite. To learn communication properly, it is often useful to make an exercise temporarily very asymmetrical.",[11,1300,1301],{},"One dancer, for example, may be given only the task of proposing a weight change, while the other's only task is to feel and take it up. Then they switch. Next, they investigate what is actually divided between the dancers during an ocho: what must the person proposing it do, and what does the person executing it organise themselves? Free embellishment can then be added, with the explicit understanding that this is not a new proposal. Only after that does the dancer executing the movement get the opportunity to offer something new while it is still being performed.",[11,1303,1304,1305,1308],{},"In this way we can ",[397,1306,1307],{},"learn symmetrically, practise temporarily asymmetrically, and eventually dance freely and asymmetrically",". This has another advantage: it becomes much easier for everyone to teach everyone else something.",[11,1310,1311],{},"In traditional teaching, someone who has followed for years may know an extraordinary amount about how an ocho feels and is performed, while having far less experience in offering the rotation. An experienced leader, conversely, may have initiated thousands of ochos without often performing the movement themselves.",[11,1313,1314,1315,1318],{},"If both dancers know both sides, you can literally say: ",[580,1316,1317],{},"you do what I'm doing for a moment, and I'll stand where you are",". Instead of merely explaining a problem, you can let each other feel what is happening.",[11,1320,1321],{},"Knowledge becomes much less dependent on role. The teacher remains important, of course, but no longer needs to be the only person in the room capable of transferring knowledge. Everyone acquires more tools for investigating with any partner why something does or does not work.",[11,1323,1324],{},"If we retain the classical abrazo—and there are certainly good reasons to do so—that also means learning to initiate all movements within that abrazo in mirror image. This creates new possibilities and space. Many existing movements have a strong preferred direction because of the position we traditionally adopt, with hand contact on one side and arm contact on the other.",[35,1326,1328],{"id":1327},"understanding-the-position-not-just-the-figure","Understanding the position, not just the figure",[11,1330,1331,1332,1335,1336,1339],{},"From quite early in tango's history, there have been teaching principles in which, instead of learning only ",[580,1333,1334],{},"how a particular figure goes",", we learn to recognise ",[397,1337,1338],{},"which possibilities arise from a particular position",", and which techniques those possibilities consist of.",[11,1341,1342],{},"A sacada then becomes more than a sequence of memorised steps. You learn what is actually happening: one dancer vacates space and, from a particular geometry, the other can occupy it. You can then investigate how many different ways that situation can arise.",[11,1344,1345],{},"The same applies to an ocho. What state makes a pivot possible? What changes if the other dancer moves? What happens if both dancers pivot? Can the same technique be performed in the other direction or by the other body? What happens when, within the traditional abrazo, the dancer on the mirrored side initiates the ocho?",[11,1347,1348,1349,1352],{},"A figure then ceases to be a recipe and becomes a recognisable instance of a more general principle. And it becomes much easier to understand why some possibilities are ",[397,1350,1351],{},"preferred possibilities",". Not everything that is technically possible works equally well. The position of the feet matters, as does the abrazo, whether the arm around the back can slide or not, momentum, differences in height between the dancers, the available space on the floor and, of course, the music.",[11,1354,1355],{},"If you know only the figure, you know one route. If you understand why the figure works from this particular state, you begin to read the landscape—and that is where creativity really begins. Suppose a movement has ended and we are each on our own axis, standing on one supporting leg. I can now move your free foot. The direction does not matter. Under certain circumstances I can even lift it. I can keep moving it until it becomes a pivot, move it with one leg and, after a step, move it back with the other. You can take the initiative and move my foot back to where it came from—something that is already becoming more common in traditional tango.",[11,1357,1358],{},"And what if a misunderstanding occurs? Those are interesting too. If an adorno is repeatedly mistaken for a proposal, perhaps the signal was unclear, and together you can investigate why—or ask another dancer or teacher. Sometimes a misunderstanding goes wrong in such an enjoyable way that it becomes inspiration for something completely new.",[35,1360,1362],{"id":1361},"a-conversation-with-two-voices","A conversation with two voices",[11,1364,1365],{},"This finally brings us back to the image with which we began: two dancers moving in a giro. One of them initiated the movement at some point, but that does not determine everything that follows. The other helps determine its speed and geometry, hears a different line in the music and gives it form. The first dancer listens and adapts. Perhaps, meanwhile, a small proposal for what comes next emerges from that second voice. The other feels it, makes room, and without anyone formally announcing that the roles have now been reversed, initiative shifts. A little later it can move the other way again.",[11,1367,1368],{},"None of this means traditional tango is wrong, or that nobody should want to be a leader or follower anymore. Sometimes it is wonderful to spend an entire tanda mostly following. Sometimes someone has a musical idea you are happy to explore with them for several minutes. Sometimes a clear temporary asymmetry simply works best.",[11,1370,1371,1372,592],{},"Equality does not lie in requiring both people to take exactly the same amount of initiative all the time. It lies in the possibility that they both ",[397,1373,1374],{},"can",[11,1376,1377],{},"The abrazo then becomes not a channel through which one body tells the other what to do, but a place where two people continuously share information about what is happening and what could happen. There can be a proposal, an uptake, a temporary division of tasks. Within that movement, two musical voices can exist without getting in each other's way. Embellishments can remain simply embellishments. A new proposal can begin to appear before the previous idea has completely disappeared.",[11,1379,1380],{},"Tango remains recognisable. There is still structure, there are still differences in tasks, and there are still moments when one person has much more direction than the other. The only difference is that it no longer has to be determined before the dance begins who will occupy which side of those differences throughout. Perhaps we can simply call it the emancipation of both follower and leader, giving each much more room to develop towards what they can and want to do.",[11,1382,1383],{},"For me, that is not a break with tango, but a fairly natural next step in a dance that has always revolved around improvisation, listening and responding to what is actually happening. Tango has already given us an exceptionally rich language for moving together.",[11,1385,1386],{},"Let's take that next step together.",[1388,1389],"hr",{},[35,1391,1393],{"id":1392},"further-viewing-and-reading","Further viewing and reading",[11,1395,1396],{},"For those who would like to explore some of the ideas behind this article further:",[11,1398,1399,1402,1403,1408,1409],{},[397,1400,1401],{},"Michael Kimmel —"," ",[580,1404,1405],{},[397,1406,1407],{},"Intersubjectivity at Close Quarters: How Dancers of Tango Argentino Use Imagery for Interaction and Improvisation"," A particularly interesting analysis of tango as shared bodily improvisation. Kimmel explores how dancers continuously recognise possibilities in one another's posture, movement and position, and how two people can function as a single moving system without choreography. ",[585,1410,1413],{"href":1411,"rel":1412},"https:\u002F\u002Fwww.degruyter.com\u002Fdocument\u002Fdoi\u002F10.1515\u002Fcogsem.2012.4.1.76\u002Fhtml",[589],[397,1414,1415],{},"Read the article at De Gruyter",[11,1417,1418,1402,1421,1426,1427],{},[397,1419,1420],{},"Luna Beller-Tadiar —",[580,1422,1423],{},[397,1424,1425],{},"Queer\u002FTango\u002FTheory: Gendered Semiosis, Dancing the Binary, and Dancing on Out"," A recent study of queer tango in which communication between the dancers takes centre stage. Beller-Tadiar discusses mutual listening, initiative, interpretation and role-switching, as well as the interesting transitional territory in which it is no longer self-evident who is leading and who is following. ",[585,1428,1431],{"href":1429,"rel":1430},"https:\u002F\u002Fwww.cambridge.org\u002Fcore\u002Fjournals\u002Fdance-research-journal\u002Farticle\u002Fqueertangotheory-gendered-semiosis-dancing-the-binary-and-dancing-on-out\u002F31214F7FD9AC9C7A76EC11EB663C6094",[589],[397,1432,1433],{},"Read the open-access article at Cambridge University Press",[11,1435,1436,1402,1439,1444,1445],{},[397,1437,1438],{},"David Kaminsky —",[580,1440,1441],{},[397,1442,1443],{},"Social Partner Dance: Body, Sound, and Space"," A broader book about social partner dance, drawing on tango, salsa, lindy hop and blues, among others. Kaminsky looks at partner dance as an interplay between yourself, your partner, the music and the surrounding space, and also examines why lead\u002Ffollow is such an effective solution to the coordination problem faced by two improvising dancers. Precisely for that reason, his work provides an interesting counterpoint to the proposal made in this article. ",[585,1446,1449],{"href":1447,"rel":1448},"https:\u002F\u002Fwww.routledge.com\u002FSocial-Partner-Dance-Body-Sound-and-Space\u002FKaminsky\u002Fp\u002Fbook\u002F9781032236902",[589],[397,1450,1451],{},"View the book at Routledge",{"title":877,"searchDepth":878,"depth":878,"links":1453},[1454,1455,1456,1457,1458,1459,1460,1461,1462,1463,1464,1465,1466,1467],{"id":986,"depth":881,"text":987},{"id":1013,"depth":881,"text":1014},{"id":1068,"depth":881,"text":1069},{"id":1094,"depth":881,"text":1095},{"id":1113,"depth":881,"text":1114},{"id":1138,"depth":881,"text":1139},{"id":1169,"depth":881,"text":1170},{"id":1217,"depth":881,"text":1218},{"id":1242,"depth":881,"text":1243},{"id":1262,"depth":881,"text":1263},{"id":1291,"depth":881,"text":1292},{"id":1327,"depth":881,"text":1328},{"id":1361,"depth":881,"text":1362},{"id":1392,"depth":881,"text":1393},"How Argentine tango can become a richer physical conversation through shared initiative, listening and response.","\u002Fimages\u002Fartikelen\u002Fargentine-tango\u002Fargentine-tango-conversation.webp","Two Argentine tango dancers in a close embrace at a warmly lit milonga",{},"\u002Fen\u002Farticles\u002Fargentine-tango-a-conversation-between-two-bodies",{"title":922,"description":1468},"en\u002Farticles\u002Fargentine-tango-a-conversation-between-two-bodies",[1476,1477,1478],"Tango","Dance","Improvisation","argentine-tango-conversation","xYqyDBmCEsRoCnwZCJedgXLCXop8Owiny0daj6r6lbo",{"id":1482,"title":1483,"body":1484,"date":902,"description":2160,"draft":904,"extension":905,"featuredImage":2161,"featuredImageAlt":2162,"meta":2163,"navigation":909,"originalUrl":910,"path":2164,"seo":2165,"stem":2166,"tags":2167,"translationKey":2171,"updated":910,"__hash__":2172},"articlesEn\u002Fen\u002Farticles\u002Fbeyond-the-event-horizon-rethinking-matter-gravity-and-a-living-universe.md","Beyond the Event Horizon: Rethinking Matter, Gravity and a Living Universe",{"type":8,"value":1485,"toc":2135},[1486,1490,1500,1527,1534,1541,1544,1548,1551,1554,1561,1568,1572,1575,1578,1581,1584,1588,1591,1594,1597,1600,1603,1606,1612,1615,1619,1622,1625,1628,1631,1634,1637,1641,1644,1647,1650,1657,1664,1668,1674,1677,1684,1687,1693,1697,1700,1703,1706,1709,1713,1716,1719,1722,1725,1728,1732,1735,1738,1741,1744,1755,1758,1762,1765,1768,1771,1774,1780,1784,1787,1794,1797,1800,1803,1807,1810,1813,1816,1823,1827,1830,1833,1840,1847,1850,1854,1857,1860,1863,1870,1874,1877,1880,1887,1890,1894,1897,1900,1903,1906,1909,1913,1916,1919,1922,1925,1928,1932,1939,1942,1945,1948,1951,1954,1958,1961,1967,1970,1973,1976,1979,1983,1986,1989,1992,1995,1998,2002,2008,2011,2014,2017,2020,2023,2026,2036,2039,2043,2046,2059,2062,2076,2079,2093,2096,2110,2113,2127,2130,2132],[35,1487,1489],{"id":1488},"from-black-hole-stars-to-a-universe-of-concentration-transformation-and-renewal","From Black Hole Stars to a Universe of Concentration, Transformation and Renewal",[11,1491,1492,1402,1497],{},[580,1493,1494],{},[397,1495,1496],{},"Author's note:",[580,1498,1499],{},"This essay grew out of an extended conversation between me and OpenAI's ChatGPT (GPT-5.6 Sol). The underlying hypothesis and line of inquiry were developed iteratively through that dialogue, with ChatGPT contributing scientific context, critical examination, research, structure and editorial development. The final argument and publication are the author's responsibility.",[11,1501,1502,1503,1510,1511,1514,1515,1518,1519,1522,1523,1526],{},"The ",[585,1504,1507],{"href":1505,"rel":1506},"https:\u002F\u002Fscience.nasa.gov\u002Fmissions\u002Fwebb\u002Fnasa-webb-finds-strongest-evidence-yet-for-black-hole-stars\u002F",[589],[397,1508,1509],{},"emerging discovery"," of ",[397,1512,1513],{},"black hole stars",", or BH★ objects, offers more than another exotic entry in the catalogue of things that exist in the universe. It challenges some of the mental pictures with which we have learned to think about black holes. The traditional image is remarkably static: matter falls inward, crosses an event horizon and disappears into a region from which nothing returns. Around that picture we have built familiar phrases such as ",[580,1516,1517],{},"gravitational sink",", ",[580,1520,1521],{},"point of no return"," and even ",[580,1524,1525],{},"black hole"," itself. They are useful descriptions, but they can easily become conceptual traps.",[11,1528,1529,1530,1533],{},"Modern observations reveal something considerably more dynamic. Black holes grow, spin, interact with magnetic fields, regulate accretion, launch relativistic jets, heat and compress interstellar gas and influence the formation of stars across their host galaxies. JWST has added another unusual configuration to this picture. Some of the mysterious compact objects known as Little Red Dots appear consistent with rapidly accreting black holes enclosed within extremely dense cocoons of gas, producing something sufficiently star-like that researchers have begun using the term ",[397,1531,1532],{},"black hole star",". In the particularly well-observed source GLIMPSE-17775, JWST detected more than forty spectral lines whose combined properties strongly support such a configuration.",[11,1535,1536,1537,1540],{},"This article uses that discovery as a starting point rather than an answer. It first reconsiders what a black hole actually is and what an event horizon does—and, just as importantly, what it does not tell us. It then follows matter as gravity concentrates it through increasingly extreme physical states, examines how accretion repeatedly creates mechanisms that push matter outward again, and asks whether this pattern could conceivably continue into regimes beyond the reach of established theory. From there, a broader possibility emerges: perhaps the universe is better understood not primarily as something that simply expands or contracts, but as a continually reorganizing ",[397,1538,1539],{},"matter–gravity system",", in which concentration, transformation and redistribution operate at many scales.",[11,1542,1543],{},"The claim is not that black holes have been shown to explode into new galaxies, or that current physics predicts such a process. It does not. The more modest point is that every time observation allows us to look deeper into extreme gravitational systems, the picture becomes less static. What appeared to be an endpoint increasingly looks like part of a process. The event horizon may mark a profound limitation on what can communicate with us in the familiar way, but a limitation on observation should not automatically be turned into a claim that the underlying physical dynamics have ended.",[35,1545,1547],{"id":1546},"begin-with-matter-rather-than-with-the-clock","Begin with matter rather than with the clock",[11,1549,1550],{},"One way to approach the problem is to imagine an impossible snapshot of a region of the universe in which all motion has temporarily been stopped. The intention is not to claim that such an operation can physically be performed. It is simply a conceptual device. In that snapshot, matter has a particular distribution. Electromagnetic fields have particular configurations. Charges, densities and other physical properties exist. Gravitational relationships exist. The system also contains whatever momentum and dynamical information is necessary to determine how it will subsequently evolve.",[11,1552,1553],{},"When motion resumes, the state changes. What we observe is matter and physical fields changing configuration. What we call time provides the quantitative ordering and comparison of those changes. A clock is itself a physical process: a pendulum moves, a quartz crystal oscillates, an atom undergoes transitions. Even the modern definition of the second ultimately refers to a reproducible physical frequency. Operationally, we compare one process of change with another.",[11,1555,1556,1557,1560],{},"This does not establish that time is unreal, nor does it contradict relativity. Relativistic proper time is experimentally measurable, and physical systems following different trajectories can genuinely accumulate different amounts of it. The narrower observation is that our physical access to time is always mediated through processes that change. We do not place an instrument into an otherwise changeless region and detect a separate substance called ",[580,1558,1559],{},"time"," flowing through it.",[11,1562,1563,1564,1567],{},"For the argument developed here, it is therefore useful to talk initially about ",[397,1565,1566],{},"matter, fields, relationships and movement",", without deciding in advance whether spacetime is the most fundamental layer of description. General relativity gives us an extraordinarily successful geometrical language for gravity, and any serious argument must respect that success. But whether spacetime geometry is itself fundamental at arbitrarily small scales is a separate question—one on which a complete theory of quantum gravity has not yet given us an experimentally established answer.",[35,1569,1571],{"id":1570},"gravity-is-an-engine-of-concentration","Gravity is an engine of concentration",[11,1573,1574],{},"Gravity possesses a simple but extraordinarily important tendency: small concentrations of matter can encourage greater concentrations. If one region of an otherwise nearly uniform distribution contains slightly more matter than its surroundings, its gravitational attraction is slightly stronger. It therefore draws in additional material, increasing its mass and making its attraction stronger still.",[11,1576,1577],{},"This mechanism, gravitational instability, is fundamental to structure formation. Tiny density differences in the early universe developed into larger concentrations. Matter collected into dark-matter haloes and galaxies. Within galaxies, gas concentrated into molecular clouds. Within sufficiently dense clouds, matter collapsed into stars. Massive stars eventually produced compact remnants, including neutron stars and black holes.",[11,1579,1580],{},"Seen this way, much of cosmic history contains a recurring direction: diffuse matter becomes concentrated matter, and concentrated matter becomes denser structure. Yet the universe is plainly not undergoing a simple one-way collapse. Galaxies contain diffuse gas. Stars eject material. Supernovae disperse heavy elements across interstellar space. Accreting black holes launch jets over enormous distances. Something repeatedly interrupts straightforward gravitational concentration.",[11,1582,1583],{},"The reason is that concentration changes the physics of the matter being concentrated.",[35,1585,1587],{"id":1586},"matter-pushes-back-because-compression-transforms-it","Matter pushes back because compression transforms it",[11,1589,1590],{},"As material falls deeper into a gravitational potential, gravitational energy is released. A rough Newtonian expression,",[11,1592,1593],{},"Egrav ≈ −GMm\u002Fr",[11,1595,1596],{},"already tells us that decreasing the characteristic radius can make enormous quantities of energy available. The detailed physics becomes more complicated in strong gravitational fields, but the principle survives: gravitational infall is an extraordinarily effective energy source.",[11,1598,1599],{},"The immediate result is not simply that the same matter occupies less space. Its temperature rises, its radiation field changes, its pressure changes and its electromagnetic behaviour may change. Eventually entirely new physical processes become possible.",[11,1601,1602],{},"A forming star demonstrates this beautifully. Gravity compresses gas until temperatures and densities become high enough for nuclear fusion. Fusion then provides an outward pressure that can oppose further collapse for millions or billions of years. Gravity has therefore created the conditions for a process that temporarily resists gravity.",[11,1604,1605],{},"When that equilibrium fails, further collapse can reveal another layer of physics. Ordinary atoms cannot survive indefinitely under increasing pressure. Ionization separates electrons from nuclei. Electron degeneracy supports white dwarfs. Beyond the relevant stability limit, matter can be driven toward neutron-rich states through weak interactions. At still greater densities, the composition of neutron-star cores becomes uncertain: researchers investigate possibilities including hyperons, meson condensates, deconfined quarks and colour-superconducting phases.",[11,1607,1608,1609],{},"The important principle is broader than any particular model of dense matter. ",[397,1610,1611],{},"Compression does not merely increase the amount of ordinary material in a smaller volume; it can change what the material physically is.",[11,1613,1614],{},"This is one of the recurring themes of extreme astrophysics. Gravity pushes matter into conditions that reveal new forms of matter, and those new forms alter the subsequent response to gravity.",[35,1616,1618],{"id":1617},"even-the-boundary-between-radiation-and-matter-becomes-dynamic","Even the boundary between radiation and matter becomes dynamic",[11,1620,1621],{},"At sufficiently high energies, everyday distinctions between matter and radiation also become less rigid. Photons have no rest mass, but sufficiently energetic photons can produce massive particle-antiparticle pairs. The familiar example is",[11,1623,1624],{},"γ + γ → e⁻ + e⁺",[11,1626,1627],{},"when the centre-of-momentum energy exceeds the necessary threshold. The reverse process can turn particle rest energy back into radiation.",[11,1629,1630],{},"Extreme astrophysical environments can therefore contain a continually interacting population of photons, electrons, positrons, nuclei and other particles, with energy moving between forms. A black-hole accretion environment is not simply a collection of intact atoms being swallowed one after another.",[11,1632,1633],{},"This matters because it discourages us from imagining gravitational collapse as a purely mechanical process involving increasingly tightly packed versions of familiar matter. At high enough energies, the constituents and interactions themselves change.",[11,1635,1636],{},"There is, however, an equally important limitation. Turning massive particles into radiation does not eliminate their gravitational influence. In general relativity, gravity couples not merely to rest mass but to the broader stress-energy content of the system, including energy, momentum and pressure. Radiation therefore continues to participate gravitationally. Energy release alone is not enough to make gravity disappear.",[35,1638,1640],{"id":1639},"a-black-hole-is-not-an-infinitely-strong-magnet","A black hole is not an infinitely strong magnet",[11,1642,1643],{},"One of the most persistent intuitive pictures of a black hole is that of an impossibly strong magnet: an object whose attraction becomes so intense that even light is pulled into it. This is understandable, but physically misleading.",[11,1645,1646],{},"Black-hole systems can possess extraordinary magnetic fields. Those fields arise primarily from electrically conducting plasma moving around the black hole, and their influence on accretion can be enormous. But magnetism is not what defines a black hole, and photons are not trapped because some magnetic attraction becomes stronger than their ability to escape.",[11,1648,1649],{},"In classical general relativity, the decisive feature is causal structure. The event horizon separates events from which future-directed signals can still reach distant observers from those from which they cannot. Once a trajectory lies inside the horizon, classical GR does not provide an outward future-directed route leading back to the same external universe.",[11,1651,1652,1653,1656],{},"That statement is stronger and stranger than saying gravity simply pulls very hard. It also means we should be careful with the phrase ",[580,1654,1655],{},"nothing happens beyond the horizon",". Classical GR says nothing of the kind. Matter continues along physical trajectories. Curvature remains dynamical. In rotating black-hole solutions the internal geometry is considerably more elaborate than the popular picture of an empty black sphere with a point sitting motionless at its centre. What changes at the horizon is our causal relationship to those events.",[11,1658,1659,1660,1663],{},"The horizon therefore marks a profound ",[397,1661,1662],{},"limit on communication and observation",", not a declaration that physical evolution has stopped.",[35,1665,1667],{"id":1666},"black-describes-our-access-better-than-the-activity","“Black” describes our access better than the activity",[11,1669,1670,1671,1673],{},"The name ",[580,1672,1525],{}," is historically effective but conceptually dangerous. It encourages the mind to substitute absence for inaccessibility. Something that cannot send conventional information back to us easily begins to feel as though it contains nothing observable and therefore nothing physically interesting.",[11,1675,1676],{},"Yet even before crossing the horizon, the environment immediately around a black hole shows how misleading the image of a passive hole can be. Matter generally approaches with angular momentum and forms an accretion flow. Turbulent and magnetic processes convert gravitational energy into radiation and kinetic energy. Magnetic fields can become highly ordered and exceptionally strong.",[11,1678,1679,1680,1683],{},"Under some conditions, magnetic flux accumulates until it significantly interferes with the accretion process itself, producing a ",[397,1681,1682],{},"magnetically arrested disk",". In rapidly spinning systems, electromagnetic fields can also extract rotational energy from the black hole through mechanisms associated with the Blandford–Znajek process.",[11,1685,1686],{},"What began as inward motion can therefore create spectacular outward motion. A black-hole system can simultaneously be swallowing matter, radiating immense power and launching relativistic plasma into intergalactic space. The outflow does not consist of material that casually crossed the event horizon and came back again. It is generated predominantly outside the horizon, where infalling matter and electromagnetic fields interact before some of the material is permanently captured.",[11,1688,1689,1690],{},"The larger lesson is nevertheless significant: ",[397,1691,1692],{},"gravitational concentration can generate the very processes that redistribute matter outward again.",[35,1694,1696],{"id":1695},"the-black-hole-participates-in-the-life-of-its-galaxy","The black hole participates in the life of its galaxy",[11,1698,1699],{},"When this feedback occurs around a supermassive black hole, its influence does not stop near the event horizon. Relativistic jets can extend across scales enormously greater than the black hole itself. Radiation and winds can heat galactic gas, generate shocks, produce turbulence and alter the supply of cold material available for star formation.",[11,1701,1702],{},"The relationship is therefore bidirectional. A galaxy supplies material to its central black hole, but the activity generated by that accretion can subsequently alter the galaxy that supplies it. Under some conditions feedback suppresses new star formation by heating or dispersing cold gas. In other environments, shocks generated by jets or outflows can compress clouds and potentially encourage local gravitational collapse.",[11,1704,1705],{},"Instead of treating a galaxy and its central black hole as separate objects connected only by infalling matter, it may be more accurate to see them as parts of one coupled system. Matter moves inward and outward on radically different scales. Energy passes between gravitational, kinetic, thermal, electromagnetic and radiative forms. The structure resulting from one stage becomes the initial condition for another.",[11,1707,1708],{},"The universe begins to look much less like an expanding container filled with objects and much more like an enormous network of interacting, self-reorganizing processes.",[35,1710,1712],{"id":1711},"black-hole-stars-make-the-dynamical-picture-harder-to-ignore","Black hole stars make the dynamical picture harder to ignore",[11,1714,1715],{},"This is where the recent BH★ observations become particularly provocative.",[11,1717,1718],{},"JWST's Little Red Dots were initially puzzling because their spectra and compact appearances were difficult to reconcile cleanly with familiar categories of galaxies and active galactic nuclei. The exceptionally deep spectrum of GLIMPSE-17775 now provides multiple independent indicators consistent with a rapidly accreting black hole enclosed inside a hot, dense cocoon of partially ionized gas. More than forty spectral lines were identified, including features whose broadening is better explained by electron scattering through a dense layered medium than by a simple rotating gas cloud.",[11,1720,1721],{},"This does not mean that every Little Red Dot has been proven to be a BH★ object. The interpretation remains an active research area. But the picture itself is remarkable: a black hole deeply embedded inside the very material feeding it, with radiation from the central accretion engine repeatedly interacting with and being reprocessed by the surrounding gas.",[11,1723,1724],{},"Other recent observations of the early universe have strengthened the broader picture of unexpectedly mature black holes existing before their host galaxies appear fully developed. These discoveries make it increasingly difficult to treat early black holes merely as inert endpoints of stellar evolution. They appear deeply entangled with the formation and evolution of surrounding structure, perhaps even preceding substantial host-galaxy growth in some cases.",[11,1726,1727],{},"The BH★ concept is therefore interesting not only because it identifies a new class of object, but because it blurs categories we once treated as distinct. A black hole can be hidden inside something with star-like atmospheric properties. A compact gravitational object can also be an accretion engine, radiation source, magnetic system and regulator of its environment at the same time.",[35,1729,1731],{"id":1730},"the-useful-question-is-not-how-big-until-it-explodes","The useful question is not “How big until it explodes?”",[11,1733,1734],{},"At this point it is tempting to imagine continuing the sequence until some object becomes simply too massive to remain stable. Stars possess critical masses. White dwarfs have stability limits. Neutron stars have maximum masses beyond which known pressure support cannot prevent collapse. Perhaps, by analogy, an ultramassive black hole eventually accumulates enough material that something similar occurs.",[11,1736,1737],{},"Classical GR does not predict such a limit. For a simple nonrotating black hole, the characteristic Schwarzschild radius grows linearly with mass,",[11,1739,1740],{},"Rₛ = 2GM\u002Fc²",[11,1742,1743],{},"Adding more mass generally produces a larger horizon rather than a black hole under greater mechanical strain. Indeed, several quantities that seem intuitively as though they ought to become more extreme at the horizon actually become less extreme for more massive black holes. Horizon-scale tidal gradients, for example, become weaker as black-hole mass increases.",[11,1745,1746,1747,1750,1751,1754],{},"So if an unknown instability exists, ",[397,1748,1749],{},"total black-hole mass by itself is unlikely to be the relevant trigger",". A more interesting question is whether some ",[580,1752,1753],{},"local state"," reached during continued gravitational collapse—extreme curvature, energy density, quantum-field configuration or something we do not yet know how to describe—undergoes a qualitative transition.",[11,1756,1757],{},"That formulation connects naturally with everything that happens at lower densities. Gravity does not need to encounter a material object that simply “breaks.” It repeatedly moves physical systems into regimes in which the equations governing their effective behaviour change.",[35,1759,1761],{"id":1760},"classical-gr-is-a-boundary-of-knowledge-not-necessarily-the-final-ontology","Classical GR is a boundary of knowledge, not necessarily the final ontology",[11,1763,1764],{},"Here classical general relativity has to play two roles at once. It is the most successful theory we possess for describing gravity on astrophysical scales, and its predictions have passed an extraordinary range of experimental tests. Any proposal about black holes that casually contradicts GR in a regime where GR has been tested is unlikely to be useful.",[11,1766,1767],{},"At the same time, classical GR openly contains indications of its own limitations. Under suitable conditions, its equations lead to singularity theorems and geodesic incompleteness. The classical description does not provide a microscopic physical theory of what matter and geometry become at arbitrarily high curvature. Nor does classical GR include quantum mechanics, even though the matter being compressed is inherently quantum mechanical.",[11,1769,1770],{},"For that reason, saying that classical GR predicts continued collapse is not the same as saying that physics has established what fundamentally occurs at the deepest stage of that collapse. A singularity is not an observed particle, phase of matter or laboratory-confirmed physical substance. It is where a classical description ceases to provide the sort of continuation we would ordinarily expect from a complete physical theory.",[11,1772,1773],{},"This distinction matters. We should neither dismiss classical GR merely because it is classical nor promote its breakdown regime into an unquestionable description of the deepest layer of reality.",[11,1775,1776,1777],{},"The scientifically cautious statement is narrower: ",[397,1778,1779],{},"up to the regimes where it is reliable, GR gives us extremely strong constraints; beyond those regimes, we do not yet possess a verified replacement.",[35,1781,1783],{"id":1782},"what-might-continue-behind-the-observational-curtain","What might continue behind the observational curtain?",[11,1785,1786],{},"Suppose matter has crossed an event horizon. From the perspective of distant observers, conventional signals from subsequent events cannot simply return through that horizon. That makes direct observation extraordinarily difficult, perhaps fundamentally impossible in the classical sense.",[11,1788,1789,1790,1793],{},"But observational inaccessibility and physical inactivity are entirely different propositions. The material has not become ",[580,1791,1792],{},"nothing",". Its energy has not ceased to gravitate. The equations do not say that magnetic, quantum or other internal degrees of freedom vanish because an external observer can no longer receive photons from them.",[11,1795,1796],{},"This suggests a different conceptual attitude toward the horizon. Rather than treating it as the edge of physical reality, we can treat it as the edge of a particular kind of observational access.",[11,1798,1799],{},"That is not a loophole allowing arbitrary claims. Quite the reverse. Because information from the region is restricted, theories of black-hole interiors are unusually difficult to test and therefore need to be treated with greater caution. But caution is different from assuming stasis.",[11,1801,1802],{},"There may be extraordinarily rich physics behind the horizon precisely where our usual observational tools become inadequate.",[35,1804,1806],{"id":1805},"could-extreme-matter-undergo-another-chain-of-transformations","Could extreme matter undergo another chain of transformations?",[11,1808,1809],{},"At lower densities we already know that increasing compression produces qualitative changes. Nothing guarantees that the sequence ends with the states of matter currently understood by nuclear physics.",[11,1811,1812],{},"One can imagine a sequence in which one state gives rise to another, and each new state changes the conditions governing the next. A sufficiently extreme transition could potentially alter conductivity, magnetic response, particle content, pressure relationships or the behaviour of quantum fields. Such a chain need not resemble a chemical chain reaction or nuclear detonation. The common feature would be that one transformation creates the conditions for another.",[11,1814,1815],{},"However, an ordinary explosion generated inside an already-existing event horizon does not solve the causal problem. Energy released there remains part of the gravitational system. Photons do not acquire a classical path back to the distant exterior merely because there are more of them, and magnetic pressure cannot simply push through the event horizon as though it were a material shell.",[11,1817,1818,1819,1822],{},"Therefore, if some deeper process reverses or radically changes collapse, it cannot be understood merely as ",[397,1820,1821],{},"matter becoming very hot and exploding",". The transition would have to involve the gravitational state itself.",[35,1824,1826],{"id":1825},"from-matter-phases-to-a-mattergravity-transition","From matter phases to a matter–gravity transition",[11,1828,1829],{},"This gives us a possible extension of the sequence we already observe: atomic matter becomes plasma; plasma under sufficient compression gives way to degenerate matter; nuclear matter emerges under still more extreme conditions; and beyond that may lie exotic quantum phases that are still only partly understood. The next step, if there is one, would not simply be “an even denser material.” It might be a regime in which the familiar separation between matter and gravitational geometry itself becomes inadequate.",[11,1831,1832],{},"That final step is speculative. We currently have no experimental evidence demonstrating that it produces a rebound or a new expanding structure. But it identifies the level at which such a mechanism would probably have to operate.",[11,1834,1835,1836,1839],{},"If gravity and the quantum state of matter become inseparable at extreme curvature, then the relevant transformation may not be adequately described as a change ",[580,1837,1838],{},"inside spacetime"," while spacetime itself remains a passive background. It may instead involve whatever more fundamental degrees of freedom ultimately give rise to both matter behaviour and gravitational geometry.",[11,1841,1842,1843,1846],{},"This is one reason the phrase ",[397,1844,1845],{},"matter–gravity state"," can sometimes be conceptually more useful than immediately talking about a “new spacetime region.” The latter phrase is natural within general relativity, but it risks turning one particular mathematical description into the underlying physical object before we actually know that spacetime is fundamental at quantum-gravity scales.",[11,1848,1849],{},"One can remain more neutral. An extreme physical configuration evolves into another extreme physical configuration. If the latter subsequently develops increasing separation between matter concentrations, cooling, structure formation and a consistent relativistic geometry, then we may describe it at macroscopic scales as an expanding region. The essential physics is the transition, not the label.",[35,1851,1853],{"id":1852},"expansion-and-contraction-may-be-too-simple-as-the-master-picture","Expansion and contraction may be too simple as the master picture",[11,1855,1856],{},"Cosmology is often presented through one dominant variable: expansion. Galaxies become more widely separated on sufficiently large scales, so we describe the universe as expanding. Alternative cosmologies then often appear as variations on the opposite idea: perhaps expansion eventually becomes contraction, perhaps contraction produces a bounce, and another expansion begins.",[11,1858,1859],{},"Those concepts are mathematically important, but as physical metaphors they can make the universe sound surprisingly mechanical—almost like a balloon repeatedly inflating and deflating. The actual universe we observe is vastly more internally active. Even while the universe expands globally, matter collapses locally. While some material falls into galaxies, other material is expelled from them. Stars form and explode. Black holes accrete and launch jets. Galaxy clusters merge. Magnetic fields are amplified, disrupted and reorganized. Radiation becomes particles and particles become radiation. Density contrasts grow even while average cosmic density decreases.",[11,1861,1862],{},"Different regions can therefore be doing radically different things at the same cosmic epoch. One region may be collapsing, another expanding, another reaching approximate equilibrium, while still another is being disrupted by feedback from a supernova or active galactic nucleus. Global expansion remains real and essential to cosmology, but it does not provide a complete intuitive picture of what the universe is physically doing.",[11,1864,1865,1866,1869],{},"A richer master image is that of an evolving network of ",[397,1867,1868],{},"matter–gravity processes operating simultaneously at different scales",". Expansion is one component of that dynamics, not necessarily the metaphor that should dominate all the others.",[35,1871,1873],{"id":1872},"a-recurring-motif-concentrate-transform-redistribute","A recurring motif: concentrate, transform, redistribute",[11,1875,1876],{},"Once viewed this way, a striking pattern appears repeatedly in established astrophysics. Gravity concentrates matter. Increased concentration changes physical conditions. Those conditions activate processes that resist, redirect or redistribute matter. The redistributed material becomes available for later gravitational structure formation.",[11,1878,1879],{},"In a star, gravitational compression enables fusion and radiation pressure. In a supernova progenitor, collapse helps create the conditions for an enormous outward release of energy and newly synthesized material. In an accretion disk, gravitational infall amplifies thermal and magnetic processes that can eject matter. Around a supermassive black hole, those outflows can alter an entire galaxy.",[11,1881,1882,1883,1886],{},"These systems are not identical, and there is no established universal law requiring every concentration event to produce a corresponding dispersal event. Yet the recurrence of the motif suggests a useful research intuition: ",[397,1884,1885],{},"do not assume that greater gravitational concentration merely gives us more of the same physics."," Historically, it repeatedly gives us new physics.",[11,1888,1889],{},"The speculative question is whether that pattern eventually terminates, or whether another transformation awaits in regimes we cannot yet observe directly.",[35,1891,1893],{"id":1892},"could-the-pattern-extend-beyond-the-horizon","Could the pattern extend beyond the horizon?",[11,1895,1896],{},"Perhaps the sequence ends classically: matter crosses an event horizon, collapse continues, and nothing corresponding to large-scale redistribution ever emerges from the interior. That remains entirely compatible with present observations.",[11,1898,1899],{},"But perhaps the progression of phase changes continues until the combined matter–gravity system reaches a regime in which the classical description itself is no longer appropriate. If a quantum-gravitational transition replaces what classical theory describes as singular collapse, the result might be another state whose macroscopic evolution is expansive rather than contractive.",[11,1901,1902],{},"Nothing in current observations establishes that final step. But this formulation is more physically disciplined than imagining a gigantic conventional explosion punching outward through a horizon. It says instead that the causal and gravitational structure itself may have to change at the transition.",[11,1904,1905],{},"Some quantum-gravity and black-hole cosmology proposals explore ideas with family resemblance to this possibility, including bounces, white-hole-like transitions and causally separated expanding regions. None currently constitutes an experimentally established description of astrophysical black-hole interiors.",[11,1907,1908],{},"The hypothesis therefore remains deliberately modest: if extreme concentration produces another qualitative transition, it would probably have to involve the coupled state of matter and gravity rather than a familiar form of pressure simply overwhelming gravity from the inside.",[35,1910,1912],{"id":1911},"a-newly-expanding-configuration-could-become-structured-again","A newly expanding configuration could become structured again",[11,1914,1915],{},"Suppose, purely hypothetically, that such a transition produced an expanding distribution of energy and matter. Expansion by itself would not create galaxies. Initially the state might be extraordinarily hot and comparatively uniform.",[11,1917,1918],{},"But if small density differences existed or later developed, gravity would again amplify them. Cooling matter could form particles and atoms. Denser regions could attract additional material. Gravitational instability could begin again, leading eventually to stars, compact objects and larger structures.",[11,1920,1921],{},"The result need not resemble the parent configuration. Different angular momenta, fluctuations, interactions and quantum outcomes could produce radically different structures.",[11,1923,1924],{},"This gives a richer form to the recurring-cycle intuition. It is not necessarily a universe that expands, contracts and then repeats the same sequence. It could instead be a hierarchy of local and global reorganizations, with concentration and dispersal occurring at different scales and in different regions.",[11,1926,1927],{},"The metaphor is no longer a cosmic heartbeat with one rhythm. It is closer to a living dynamical system with many overlapping rhythms.",[35,1929,1931],{"id":1930},"living-without-implying-biology","“Living” without implying biology",[11,1933,1934,1935,1938],{},"Describing the universe as ",[580,1936,1937],{},"living"," here is metaphorical, but the metaphor has value if used carefully.",[11,1940,1941],{},"It does not mean that the universe is biologically alive or possesses intention. It means that its large-scale appearance emerges from countless interacting processes that continuously alter one another's conditions.",[11,1943,1944],{},"A galaxy is not simply placed into a finished spacetime. Its matter circulates. Stars manufacture elements. Supernovae redistribute them. Black-hole feedback changes gas temperatures. Magnetic fields guide charged particles. Mergers restructure orbital distributions. New stars emerge from material processed by previous generations.",[11,1946,1947],{},"The state of the system creates the conditions for its next state. In that limited but meaningful sense, the universe is much closer to an evolving ecology than to a static collection of celestial objects moving apart because a background coordinate happens to expand.",[11,1949,1950],{},"The discovery of objects such as BH★ candidates reinforces this picture because it blurs categories that once seemed clean. Here is something that contains a black hole, is powered by black-hole accretion, is surrounded by a dense gaseous envelope and can produce observational properties sufficiently star-like to motivate a hybrid name.",[11,1952,1953],{},"Nature is under no obligation to respect the nouns we invented for convenient classification.",[35,1955,1957],{"id":1956},"the-event-horizon-as-an-epistemic-warning-sign","The event horizon as an epistemic warning sign",[11,1959,1960],{},"There is therefore another way to interpret the event horizon conceptually.",[11,1962,1963,1964,592],{},"It is unquestionably a real and important structure in classical relativity. But for us as investigators, it is also a warning that ",[397,1965,1966],{},"our usual method of watching the universe has reached a severe boundary",[11,1968,1969],{},"Astronomy is built overwhelmingly on signals arriving from elsewhere: photons, gravitational waves, neutrinos and particles. An event horizon restricts which signals can reach us. Once ordinary causal communication from an event is lost, reconstructing the physical state becomes dramatically harder.",[11,1971,1972],{},"The danger is then psychological as much as mathematical. What cannot be observed directly is easily imagined as a featureless nothing.",[11,1974,1975],{},"History gives us reasons to resist that shortcut. Atoms were once inaccessible to direct observation. Stellar interiors remain inaccessible to direct sampling. Neutron-star cores cannot be visited. The early universe cannot be observed using ordinary visible light beyond certain epochs. In each case, physics developed indirect ways to constrain unseen processes.",[11,1977,1978],{},"A black-hole interior is more challenging because its causal restriction is deeper. We may ultimately find that some information is fundamentally inaccessible from our exterior region. But “inaccessible” and “nonexistent” remain different words.",[35,1980,1982],{"id":1981},"what-would-turn-the-speculation-into-physics","What would turn the speculation into physics?",[11,1984,1985],{},"The hypothesis becomes scientifically interesting only when it produces consequences that differ from established alternatives.",[11,1987,1988],{},"The near-term questions are therefore not whether a black hole secretly contains another universe. They are questions that increasingly precise observations can actually address. How do BH★ candidates vary over time? How stable are their dense envelopes? What controls transitions between accretion and outflow? How efficiently can magnetic flux arrest infalling material? Do extreme accretors display recurring instability cycles? How rapidly do their central black holes grow? What effect do their outflows have on the development of their host environments?",[11,1990,1991],{},"At higher energies, neutron-star observations and gravitational-wave measurements can constrain the equation of state of ultradense matter and perhaps identify phase transitions that occur before black-hole formation. At the theoretical frontier, quantum-gravity models should ideally produce predictions that can be related to observable phenomena rather than merely replacing one inaccessible interior story with another.",[11,1993,1994],{},"A serious theory of a deeper matter–gravity cycle would ultimately need to answer several difficult questions. What physical variable reaches a critical value? What state changes? How is energy conserved? How is entropy treated? What happens to causal structure? Does information remain recoverable? What observable signature distinguishes the transition from ordinary accretion or collapse?",[11,1996,1997],{},"Until such questions have testable answers, the final step remains a hypothesis.",[35,1999,2001],{"id":2000},"conclusion-perhaps-the-hole-was-never-the-most-interesting-part","Conclusion: perhaps the “hole” was never the most interesting part",[11,2003,2004,2005,592],{},"The most revealing development in black-hole research may be that black holes themselves increasingly look less like isolated objects and more like ",[397,2006,2007],{},"participants in cosmic circulation",[11,2009,2010],{},"Matter approaches them, changes state, releases gravitational energy, generates radiation, amplifies magnetic fields and sometimes gets expelled again at extraordinary velocities. Those outflows alter galaxies. Galaxies subsequently determine what matter becomes available for accretion. In the early universe, BH★ candidates may represent an even more intimate arrangement in which a rapidly growing black hole is embedded inside a dense envelope that transforms the radiation and behaviour of the entire system.",[11,2012,2013],{},"The event horizon remains one of the deepest causal boundaries known to physics, but it should not be confused with a physical declaration that “nothing more happens.” It marks the point beyond which our familiar observational relationship with events changes radically. What the underlying matter–gravity system does beyond that boundary is constrained by classical relativity but not completely described by a verified theory of quantum gravity.",[11,2015,2016],{},"Classical GR therefore deserves both respect and restraint. It tells us vastly more about black holes than intuition ever could, but its singular regimes also tell us that it is unlikely to be the final microscopic description of nature under every conceivable condition.",[11,2018,2019],{},"The broader pattern revealed by astrophysics is striking. Gravity concentrates matter, concentration changes matter, changed matter alters its gravitational environment, and the resulting feedback redistributes energy and material into new structures. We know that this happens in stars, supernovae, accretion flows, galaxies and clusters. We do not yet know whether the same motif continues through whatever fundamental physics replaces classical collapse at its deepest extreme.",[11,2021,2022],{},"That uncertainty leaves open a more interesting picture of the universe than a simple choice between eternal expansion and eventual contraction. Global expansion may describe one important aspect of cosmic evolution, while simultaneously an immense hierarchy of local processes concentrates, transforms and redistributes matter in every direction and on almost every scale.",[11,2024,2025],{},"The emerging black hole star may therefore be valuable not only because it adds a new kind of object to astronomy, but because it reminds us how provisional our categories are. A “star” can contain a black-hole engine. A black hole can drive matter outward as effectively as it draws matter inward. A gravitational sink can regulate the creation of stars thousands of light-years away. An observational boundary need not be a physical endpoint.",[11,2027,2028,2029,2032,2033],{},"Perhaps the most productive question is consequently not ",[580,2030,2031],{},"What finally falls into the hole?"," but rather: ",[397,2034,2035],{},"What does matter become as gravity continuously pushes it into regimes the universe has never allowed us to observe directly?",[11,2037,2038],{},"Every increase in observational power has so far made the answer more dynamic, not less. Whether that dynamism ultimately ends at the event horizon, continues invisibly behind it, or reveals an entirely deeper cycle of matter and gravity remains one of the places where what we know meets what we have only begun to imagine.",[35,2040,2042],{"id":2041},"sources-and-further-reading","Sources and further reading",[11,2044,2045],{},"For readers interested in the observational evidence and scientific work that inspired this essay:",[11,2047,2048,1402,2051,1402,2054],{},[397,2049,2050],{},"NASA \u002F James Webb Space Telescope (2026)",[580,2052,2053],{},"Webb Finds Strongest Evidence Yet for “Black Hole Stars”",[585,2055,2057],{"href":1505,"rel":2056},[589],[397,2058,1505],{},[11,2060,2061],{},"An accessible overview of JWST observations of GLIMPSE-17775. Its spectrum contains more than 40 identified spectral lines and provides some of the strongest observational evidence so far for a rapidly accreting black hole embedded within a dense gas cocoon.",[11,2063,2064,1402,2067,1402,2070],{},[397,2065,2066],{},"ESA \u002F Webb (2026)",[580,2068,2069],{},"Webb finds strongest evidence yet for “black hole stars”",[585,2071,2074],{"href":2072,"rel":2073},"https:\u002F\u002Fesawebb.org\u002Fnews\u002Fweic2610\u002F",[589],[397,2075,2072],{},[11,2077,2078],{},"The European Space Agency's Webb science release covering the same observations and the physical interpretation of the dense environment surrounding the black hole.",[11,2080,2081,1402,2084,1402,2087],{},[397,2082,2083],{},"Rusakov et al., Nature (2026)",[580,2085,2086],{},"Little red dots as young supermassive black holes in dense ionized cocoons",[585,2088,2091],{"href":2089,"rel":2090},"https:\u002F\u002Fwww.nature.com\u002Farticles\u002Fs41586-025-09900-4",[589],[397,2092,2089],{},[11,2094,2095],{},"Peer-reviewed research supporting the interpretation of some JWST Little Red Dots as rapidly growing supermassive black holes surrounded by dense ionized material.",[11,2097,2098,1402,2101,1402,2104],{},[397,2099,2100],{},"Juodžbalis et al., Nature (2026)",[580,2102,2103],{},"A direct black-hole mass measurement in a little red dot at high redshift",[585,2105,2108],{"href":2106,"rel":2107},"https:\u002F\u002Fdoi.org\u002F10.1038\u002Fs41586-026-10579-4",[589],[397,2109,2106],{},[11,2111,2112],{},"A direct dynamical measurement providing evidence for a roughly 50-million-solar-mass black hole at redshift 7.04, offering an important constraint on how massive black holes developed in the early universe.",[11,2114,2115,1402,2118,1402,2121],{},[397,2116,2117],{},"Sun et al. (2026)",[580,2119,2120],{},"Little Red Dot − Host Galaxy = Black Hole Star: A Gas-Enshrouded Heart at the Center of Every Little Red Dot",[585,2122,2125],{"href":2123,"rel":2124},"https:\u002F\u002Farxiv.org\u002Fabs\u002F2601.20929",[589],[397,2126,2123],{},[11,2128,2129],{},"A more explicitly theoretical exploration of the “Black Hole Star” interpretation and its possible relationship to the Little Red Dot population.",[1388,2131],{},[11,2133,2134],{},"The later sections of this essay deliberately move beyond these observations into speculation about matter, gravity, extreme phase transitions and the possible limits of classical general relativity. Those ideas should not be read as conclusions of the studies above. They are questions motivated by them: an attempt to explore what the increasingly dynamic picture of black-hole systems might imply if some of its recurring patterns continue into physical regimes we cannot yet observe directly.",{"title":877,"searchDepth":878,"depth":878,"links":2136},[2137,2138,2139,2140,2141,2142,2143,2144,2145,2146,2147,2148,2149,2150,2151,2152,2153,2154,2155,2156,2157,2158,2159],{"id":1488,"depth":881,"text":1489},{"id":1546,"depth":881,"text":1547},{"id":1570,"depth":881,"text":1571},{"id":1586,"depth":881,"text":1587},{"id":1617,"depth":881,"text":1618},{"id":1639,"depth":881,"text":1640},{"id":1666,"depth":881,"text":1667},{"id":1695,"depth":881,"text":1696},{"id":1711,"depth":881,"text":1712},{"id":1730,"depth":881,"text":1731},{"id":1760,"depth":881,"text":1761},{"id":1782,"depth":881,"text":1783},{"id":1805,"depth":881,"text":1806},{"id":1825,"depth":881,"text":1826},{"id":1852,"depth":881,"text":1853},{"id":1872,"depth":881,"text":1873},{"id":1892,"depth":881,"text":1893},{"id":1911,"depth":881,"text":1912},{"id":1930,"depth":881,"text":1931},{"id":1956,"depth":881,"text":1957},{"id":1981,"depth":881,"text":1982},{"id":2000,"depth":881,"text":2001},{"id":2041,"depth":881,"text":2042},"From black hole stars to a speculative view of the universe as a dynamic system of concentration, transformation and renewal.","\u002Fimages\u002Fartikelen\u002Fbeyond-the-event-horizon\u002Fblack-hole-inside.webp","A view inside a black hole represented as a luminous, dynamic cosmic structure",{},"\u002Fen\u002Farticles\u002Fbeyond-the-event-horizon-rethinking-matter-gravity-and-a-living-universe",{"title":1483,"description":2160},"en\u002Farticles\u002Fbeyond-the-event-horizon-rethinking-matter-gravity-and-a-living-universe",[2168,2169,2170],"Physics","Black Holes","Cosmology","beyond-the-event-horizon","mNdbGU0Ov14T4k43f8y9vs4MO-CHU-pcgIXpx_xcO20",{"id":2174,"title":2175,"body":2176,"date":902,"description":2673,"draft":904,"extension":905,"featuredImage":2674,"featuredImageAlt":2675,"meta":2676,"navigation":909,"originalUrl":910,"path":2677,"seo":2678,"stem":2679,"tags":2680,"translationKey":2682,"updated":910,"__hash__":2683},"articlesEn\u002Fen\u002Farticles\u002Fresetting-time-to-its-proper-place-in-physics-and-beyond.md","Resetting Time to Its Proper Place in Physics and Beyond",{"type":8,"value":2177,"toc":2645},[2178,2182,2187,2191,2195,2198,2208,2211,2214,2218,2221,2224,2227,2230,2234,2237,2240,2243,2250,2254,2261,2264,2267,2270,2274,2281,2284,2287,2290,2296,2300,2303,2306,2309,2313,2316,2319,2322,2325,2329,2335,2341,2344,2347,2350,2354,2357,2360,2363,2366,2370,2373,2376,2379,2383,2390,2393,2396,2399,2403,2406,2409,2412,2416,2419,2422,2425,2428,2432,2435,2438,2441,2444,2447,2451,2458,2461,2464,2468,2471,2474,2477,2484,2488,2491,2494,2501,2505,2508,2511,2514,2517,2521,2524,2527,2530,2534,2537,2540,2543,2547,2550,2553,2556,2560,2563,2566,2574,2577,2580,2583,2589,2593,2612,2631,2642],[35,2179,2181],{"id":2180},"time-matters-but-matter-matters-more","Time Matters. But Matter matters more.",[11,2183,2184],{},[580,2185,2186],{},"Author's note: This essay grew out of an extended conversation between me and OpenAI's ChatGPT (GPT-5.6 Sol). The underlying hypothesis and line of inquiry were developed iteratively through that dialogue, with ChatGPT contributing scientific context, critical examination, research, structure and editorial development. The final argument and publication are the author's responsibility.",[534,2188,2190],{"id":2189},"resetting-time-to-its-proper-place-in-physics","Resetting Time to Its Proper Place in Physics",[35,2192,2194],{"id":2193},"time-matters-but-matter-matters-more-1","Time matters. But matter matters more.",[11,2196,2197],{},"Physics tells us that time slows down near massive objects, that velocity causes time dilation, that different observers can accumulate different amounts of proper time, and that matter follows worldlines through spacetime. These statements have precise meanings within relativity, and the theory predicts the corresponding observations with extraordinary accuracy. Yet the language can also encourage a surprisingly misleading mental picture of what the underlying experiments actually show.",[11,2199,2200,2201,2203,2204,2207],{},"Grammatically, ",[580,2202,1559],{}," behaves like an ordinary noun. Time passes, time slows down, gravity affects time, we move through time, time stops, and we travel through spacetime. These sentences make it remarkably easy to imagine time as a physical participant: gravity acts upon time, time consequently runs more slowly, and slower time then causes atoms, clocks and people to change more slowly. Likewise, ",[580,2205,2206],{},"spacetime"," can become a four-dimensional environment through which matter seems to travel, making yesterday and tomorrow sound a little like places. Amsterdam exists at one set of spatial coordinates, so perhaps Amsterdam in 1650 exists somewhere else along a temporal coordinate.",[11,2209,2210],{},"None of that is required to use relativity successfully. Strip the temporal terminology away for a moment and look at what we physically do. We take two physical systems, compare them, let them follow different trajectories through different physical environments, and compare them again where possible. Their states may now differ. Atomic clocks may have accumulated different numbers of transitions, other suitable clocks show corresponding differences, and under sufficiently extreme relativistic conditions even biological ageing can diverge.",[11,2212,2213],{},"General relativity predicts these relationships with extraordinary accuracy, but what we physically observe is not “time itself” acting on anything. We compare the history of change in one physical system with the history of change in another. That distinction is the subject of this essay. Before saying what time did, it is often worth asking a more concrete set of questions: which physical systems are being compared, which state changes were measured, what were they measured against, and what physical histories produced the difference?",[35,2215,2217],{"id":2216},"we-measure-change-with-change","We measure change with change",[11,2219,2220],{},"Every clock humanity has ever constructed is a changing physical system. A pendulum changes position, a quartz crystal oscillates, and an atomic clock uses a reproducible atomic process. Even observing the clock requires further physical change: photons reach a detector, electrical states change, information is stored and neurons respond.",[11,2222,2223],{},"The official definition of the second makes this wonderfully explicit. The SI second is defined by fixing the frequency associated with a particular transition of caesium-133 at exactly 9,192,631,770 hertz. Before atomic standards, our temporal units ultimately depended on astronomical changes such as the rotation of the Earth. Our clocks improved because we found physical processes whose changes provided more stable references. The reference process changed, but the underlying principle did not.",[11,2225,2226],{},"Suppose I want to determine how long some experiment takes. I place a clock beside it. The experiment is one changing physical system and the clock is another. During a particular sequence of state changes in the experiment, the reference system completes a particular number of reproducible changes. Calling the result “five seconds” is extraordinarily convenient, but underneath the unit we are still comparing one physical history with another.",[11,2228,2229],{},"This suggests a slightly different starting point from the familiar statement that “time measures change.” At the empirical level, physical systems undergo sequences of state change, and we compare those histories with other physical histories. Time is the abstraction physics uses to express their ordering and relationships.",[35,2231,2233],{"id":2232},"the-matter-box-experiment","The matter-box experiment",[11,2235,2236],{},"Imagine two, as far as physically possible, identical sealed boxes, A and B. Each contains identical atoms, identical atomic clocks, identical chemical processes and, if we want to make the thought experiment more vivid, an identical human observer. We begin with the boxes together and establish corresponding initial states. We synchronize the processes we intend to compare and call this initial configuration (S_0).",[11,2238,2239],{},"Then we separate them. Box A follows one route through the universe while Box B follows another. They may travel at different velocities, accelerate differently, pass at different distances from massive bodies, or experience different gravitational environments. One could remain near Earth's surface while another travels far from Earth; in a more extreme version, one could approach a black hole.",[11,2241,2242],{},"Where physically possible, we eventually bring them together again and compare them. Their states are no longer necessarily equivalent. Their clocks may disagree, corresponding physical processes may have accumulated different numbers of transitions, and if the relativistic difference is sufficiently large the observers themselves may have aged differently.",[11,2244,2245,2246,2249],{},"We should be careful here with the phrase “amount of change.” There is no obvious universal scalar called ",[580,2247,2248],{},"change",". A system can move enormous distances while changing little chemically, or undergo trillions of electromagnetic oscillations without much macroscopic displacement. What we can do is select corresponding reproducible processes in the two boxes and compare their histories. The remarkable discovery underlying relativity is that these comparisons exhibit a universal structure, and relativity captures that structure mathematically.",[35,2251,2253],{"id":2252},"putting-proper-time-back-into-the-experiment","Putting proper time back into the experiment",[11,2255,2256,2257,2260],{},"Within relativity, ",[580,2258,2259],{},"proper time"," has a precise definition. A physical system follows what the theory calls a worldline through spacetime, and the spacetime metric assigns an invariant quantity along that trajectory. The potential confusion begins when we reverse the explanatory direction.",[11,2262,2263],{},"It is tempting to say that Box A accumulated less proper time than Box B and therefore the physical processes in A advanced less far. Within the formalism, that is perfectly ordinary language. Operationally, however, how did we establish the proper-time difference? We compared physical processes. There is no second device hidden behind the atomic clock that independently measures a substance called proper time and tells us whether the atoms obeyed it correctly. The clock itself is a physical system undergoing reproducible state changes.",[11,2265,2266],{},"A state-first description therefore runs in the opposite direction. Boxes A and B follow different physical histories. When we compare corresponding processes, they have accumulated different numbers of state transitions. Those differences display a universal relationship. General relativity represents that relationship geometrically, and the invariant scale along each history is what we call proper time.",[11,2268,2269],{},"In this sense, proper time is not an additional mechanism making matter behave differently. It is the geometric measure relativity assigns along a physical history, physically realized by an ideal clock travelling with that history. The distinction does not change the predictions of relativity, but it does change the conceptual hierarchy through which we understand them.",[35,2271,2273],{"id":2272},"gravitational-time-dilation-is-useful-shorthand","Gravitational time dilation is useful shorthand",[11,2275,2276,2277,2280],{},"The same issue becomes especially visible in the phrase ",[580,2278,2279],{},"gravitational time dilation",". We commonly say that gravity makes time run slower. It is compact, memorable and mathematically meaningful, but unpack the statement experimentally and ask what physical systems were compared, which processes changed, and what they were measured against.",[11,2282,2283],{},"Take two sufficiently accurate clocks, compare them initially, let them follow histories at different gravitational potentials, and then compare their physical processes according to an appropriate procedure. Their readings diverge in precisely the systematic manner predicted by general relativity. Modern optical clocks can detect extraordinarily small differences associated with elevation, which makes this one of the most striking examples of relativity becoming directly measurable in ordinary terrestrial conditions.",[11,2285,2286],{},"The phenomenon is real, but “gravity slowed time” is already a compressed description of that phenomenon. What the experiment directly gives us is a relationship between changing physical systems that followed different histories relative to the surrounding distribution of mass-energy.",[11,2288,2289],{},"There is an essential qualification. We should not replace “gravity slows time” with the equally misleading idea that gravity merely interferes with the mechanism of a caesium clock. If that were all that happened, replacing caesium with an unaffected process should make the effect disappear. That is not what relativity predicts. Suitable clocks based on different physical processes exhibit the same relativistic relationship. This universality is precisely why proper time and spacetime geometry are such powerful abstractions.",[11,2291,2292,2293,2295],{},"So the complete operational description is cumbersome, which is why terms such as ",[580,2294,2279],{}," exist. There is nothing wrong with shorthand; the problem begins when we forget that it is shorthand.",[35,2297,2299],{"id":2298},"location-matters-coordinates-do-not-cause-anything","Location matters, coordinates do not cause anything",[11,2301,2302],{},"Our matter boxes also make another distinction important. Coordinates are labels. If I describe exactly the same physical situation using another coordinate system, I have not changed the experiment. The numbers themselves exert no influence on the boxes.",[11,2304,2305],{},"But physical location absolutely matters. A box on Earth's surface occupies a different physical relationship to Earth's mass-energy distribution from a box far away. A box travelling close to a neutron star or black hole follows a dramatically different physical history from one travelling through comparatively weak gravitational conditions. Likewise, the route matters. Two boxes can begin together and eventually reunite while following radically different trajectories in between.",[11,2307,2308],{},"So saying that coordinates do not matter physically can itself become misleading. Arbitrary coordinate labels do not matter, but the physical relationships represented by location and trajectory certainly do. This is another place where language can hide an important distinction between the representation and what is represented.",[35,2310,2312],{"id":2311},"a-black-hole-is-an-extreme-test","A black hole is an extreme test",[11,2314,2315],{},"A black hole makes the distinction vivid. Imagine Box A remaining far from a black hole while Box B travels close to it and later returns, assuming we choose a trajectory for which returning is possible. When reunited, corresponding physical processes in the two boxes need not have accumulated identical histories.",[11,2317,2318],{},"The usual shorthand says that B experienced gravitational time dilation. Our alternative description simply delays introducing that terminology. The boxes began in corresponding states, followed different physical histories through dramatically different gravitational conditions, and returned with systematically different states. General relativity predicts the relationship.",[11,2320,2321],{},"Now allow B to cross the event horizon. The event horizon is not merely an arbitrary coordinate line. Particular coordinate systems can behave badly there, but changing coordinates does not remove the causal distinction associated with being inside the horizon. Yet the falling box does not locally encounter a sign saying “TIME STOPS HERE.” For a sufficiently large black hole, its atoms continue changing normally as it crosses the horizon, its clock continues operating, chemical processes continue and its observer continues thinking.",[11,2323,2324],{},"A distant observer obtains a very different picture through the signals received from the falling box. This makes statements such as “time freezes at the event horizon” excellent examples of the problem discussed here. Without specifying whose clock, which signals and which comparison procedure we mean, an efficient piece of relativistic shorthand becomes an apparently causal statement about something called time. The more useful questions are concrete: what is happening to the falling physical system, what is happening to the distant system, what information can pass between them, and which changing processes are being compared?",[35,2326,2328],{"id":2327},"spacetime-is-a-framework-for-relationships-among-histories","Spacetime is a framework for relationships among histories",[11,2330,2331,2332,2334],{},"This brings us to perhaps the most powerful term of all: ",[580,2333,2206],{},". Relativity demonstrates that spatial and temporal relationships cannot generally be separated in the Newtonian manner. Minkowski's geometrical reformulation of special relativity and Einstein's general relativity provide an extraordinarily successful framework for describing events, trajectories, gravity and causality.",[11,2336,2337,2338,2340],{},"Nothing in this essay requires rejecting that framework. But ",[580,2339,2206],{}," is also a word, and words carry intuitions. It is very easy to imagine a four-dimensional substance containing three familiar directions called space and another comparable direction called time. Matter then seems to move through this container, and past and future begin to sound like locations within it.",[11,2342,2343],{},"From there the science-fiction intuition almost writes itself. Amsterdam exists at one set of spatial coordinates, while Amsterdam in 1650 exists at another temporal coordinate. Perhaps a sufficiently advanced machine merely needs to find the correct route. The mathematics does not automatically require that intuitive ontology.",[11,2345,2346],{},"For the purposes of this essay, I find a more cautious description useful: spacetime is the geometric framework through which relativity represents relationships among physical events and histories. Our matter box follows a physical history, its state changes, other boxes follow other histories, signals propagate between them, and matter-energy relates to the gravitational geometry that constrains possible trajectories and causal relationships. Relativity describes all of this mathematically with extraordinary accuracy.",[11,2348,2349],{},"The map is extraordinarily good. That does not mean every intuitive property suggested by the language of the map must be projected back onto the territory.",[35,2351,2353],{"id":2352},"the-clock-is-another-matter-box","The clock is another matter box",[11,2355,2356],{},"There is a useful consequence of looking at the problem this way: a clock stops being conceptually special. It is another physical system following its own history.",[11,2358,2359],{},"Suppose Box A contains the experiment I care about and Box C contains my reference clock. To measure the duration of some process in A, I correlate changes in A with reproducible changes in C. Now send C along another physical trajectory and the reference process itself acquires a different relationship to A.",[11,2361,2362],{},"This is exactly the kind of situation relativity teaches us how to handle. There is no privileged universal reference clock sitting outside the universe. Every actual clock is itself a physical system with a physical history. Proper time can therefore usefully be thought of as the local invariant scale along a particular timelike history, while an ideal clock physically realizes that scale through its own state changes.",[11,2364,2365],{},"That observation makes the success of relativity more impressive rather than less. Despite every clock being another participant in physical reality, suitable clocks exhibit relationships that can be captured by a common geometry. Viewed from this direction, relativity describes relationships among histories of physical processes, and temporal quantities provide an extraordinarily efficient language for expressing those relationships.",[35,2367,2369],{"id":2368},"the-observer-is-another-changing-system","The observer is another changing system",[11,2371,2372],{},"Observation itself cannot escape this structure. For one physical system to observe another, something must interact. A photon reaches a retina, an electrical state changes in a detector, a magnetic state stores a bit, neurons alter their firing patterns, and information becomes physically represented somewhere.",[11,2374,2375],{},"The observer therefore cannot stand outside the universe and inspect time independently. The object changes, the reference clock changes, the measuring apparatus changes and the observer changes. Our empirical description is constructed from correlations among those changes.",[11,2377,2378],{},"This does not require us to settle any deeper metaphysical question about time. The narrower point is enough: every measurement through which we assign temporal quantities is realized through physical processes and comparisons among physical histories. Relativity describes the structure of those comparisons extraordinarily well.",[35,2380,2382],{"id":2381},"so-what-is-now","So what is “now”?",[11,2384,2385,2386,2389],{},"The same perspective changes the way I think about the present. Ordinary intuition imagines ",[580,2387,2388],{},"now"," as a universal boundary sweeping forward through reality. Relativity already undermines the universal part of that intuition because spatially separated events that one observer regards as simultaneous need not be simultaneous for another.",[11,2391,2392],{},"Our brains complicate the subjective version. Conscious experience is not an instantaneous snapshot. Signals propagate at finite speeds, sensory information is processed, and the brain integrates information over intervals before producing our experience of a coherent present.",[11,2394,2395],{},"From a state-oriented perspective, “now” can be treated more modestly as the current physical configuration from which a system can interact. The past survives in that configuration through physical traces such as memories, photographs, fossils, scars, documents, geological structures and radiation. The future appears differently, through predictions and representations of possible subsequent states.",[11,2397,2398],{},"My memory of yesterday exists physically now as a current configuration of my brain, while my prediction about tomorrow also exists physically now. Both are present states containing information about other states.",[35,2400,2402],{"id":2401},"the-arrow-becomes-an-asymmetry-of-physical-histories","The arrow becomes an asymmetry of physical histories",[11,2404,2405],{},"We often say that time flows from past to future, but again it is useful to ask what we actually observe. Heat disperses, eggs break and almost never spontaneously reassemble, organisms age, records accumulate, causes leave traces in subsequent states, and our brains contain memories correlated with earlier conditions rather than memories of tomorrow.",[11,2407,2408],{},"There is an enormous asymmetry in physical histories. Thermodynamics describes a fundamental part of that asymmetry through entropy. Many microscopic laws possess time-reversal symmetries or closely related forms of reversibility, yet macroscopic state evolution displays an overwhelming directionality.",[11,2410,2411],{},"Rather than beginning by saying that an entity called time flows forward and everything else follows it, we can begin with the observed asymmetry of physical state evolution. That does not solve the arrow-of-time problem, but it places the explanatory burden somewhere more concrete: why do physical histories exhibit such a strong statistical asymmetry?",[35,2413,2415],{"id":2414},"travelling-into-the-future-becomes-differential-history","Travelling into the future becomes differential history",[11,2417,2418],{},"The matter-box model gives us a cleaner way to discuss time travel. Suppose I want to encounter an Earth that has undergone fifty years' worth of familiar physical change while undergoing as little change myself as possible. The conceptual requirement is straightforward: Earth and I must follow very different physical histories.",[11,2420,2421],{},"Perfect suspended animation provides an imaginary example. If my biological state could somehow be preserved almost perfectly while Earth continued changing, I could be revived into a world transformed by fifty years while my own physical state had changed comparatively little. We cannot currently do this to humans reversibly, but the thought experiment makes the relationship obvious.",[11,2423,2424],{},"Relativity provides a genuine physical route to differential ageing. Send our matter box along an appropriate high-velocity trajectory and later reunite it with Earth. Corresponding clocks and other physical processes can then show dramatically different accumulated histories.",[11,2426,2427],{},"We call this relativistic time dilation. In the vocabulary developed here, future-directed time travel is differential state evolution along different physical histories. Nothing needs to reverse.",[35,2429,2431],{"id":2430},"travelling-into-the-past-asks-for-something-else","Travelling into the past asks for something else",[11,2433,2434],{},"Now ask for the opposite: I want to travel back to 1976. The familiar time-travel picture encourages me to imagine 1976 as a destination that still exists somewhere along a temporal axis, just as Paris exists elsewhere in space. A sufficiently advanced machine merely needs to find the right route.",[11,2436,2437],{},"The state-oriented question is different: what physically made 1976 be 1976? It was a particular configuration of matter, radiation, fields, organisms, information and relationships. People had particular bodies and memories, buildings occupied particular states, photons propagated in particular directions, heat was distributed differently, records that exist today had not yet been created, and many people alive today did not yet exist.",[11,2439,2440],{},"If by returning to 1976 I mean literally restoring that earlier physical situation, those changes have to be undone. Trees must become younger, chemical reactions must reverse, radiation must return to previous configurations, heat that dispersed must reconcentrate, memories accumulated since then must disappear and physical records of subsequent events must be removed.",[11,2442,2443],{},"Then we encounter the traveller problem. Suppose the surrounding universe is somehow restored perfectly to its earlier configuration while I remain my present-day self. We have already failed to restore the original state, because the universe now contains something the original configuration did not contain: me, carrying physical information about events that, according to the reconstructed surroundings, have not happened.",[11,2445,2446],{},"We have created a new state resembling 1976. That is not the original 1976.",[35,2448,2450],{"id":2449},"reversing-movement-is-not-enough","Reversing movement is not enough",[11,2452,2453,2454,2457],{},"My original intuition about backwards time travel was simpler: perhaps I could remain unchanged while everything else in the universe retraced its movements. That captures part of the idea, but ",[580,2455,2456],{},"movement"," is too narrow.",[11,2459,2460],{},"Physical reality includes radiation, fields, thermodynamic distributions, quantum states and correlations, and chaotic systems in which tiny differences can amplify enormously. Restoring an earlier physical configuration would therefore require much more than reversing the visible velocities of macroscopic objects. The relevant physical state and its relationships would have to retrace their history with extraordinary precision.",[11,2462,2463],{},"So the original intuition becomes more precise: literal return to the past, if by that we mean restoring the actual past, is a problem of state restoration rather than merely motion reversal. That is a fundamentally different requirement from arranging for two systems to accumulate different histories before meeting again.",[35,2465,2467],{"id":2466},"a-causal-loop-is-not-a-restored-past","A causal loop is not a restored past",[11,2469,2470],{},"General relativity introduces an important complication. Some mathematical solutions contain closed timelike curves: trajectories through spacetime that loop into their own causal past. These are often described as examples of general relativity permitting time travel, although whether physically realizable versions can exist is a much deeper question involving global spacetime structure, unusual physical conditions and possible quantum constraints.",[11,2472,2473],{},"Even granting such a curve for the thought experiment, our distinction still matters. Put the matter box on the curve. Inside the box, its physical processes need not reverse; its atoms continue changing, its clock continues operating and its observer can continue forming memories.",[11,2475,2476],{},"The box could therefore encounter an earlier part of the surrounding causal history as a later physical state of itself. That is not state restoration. The surrounding environment may correspond to an earlier portion of its history, but it now interacts with a system containing information accumulated subsequently. That is precisely why causal loops produce such strange paradoxes.",[11,2478,2479,2480,2483],{},"Ordinary language therefore collapses several profoundly different ideas into the phrase ",[580,2481,2482],{},"travelling through time",". Future-directed relativistic travel is differential state evolution, literal restoration of an earlier world is state restoration, creating a new present that resembles an earlier state is state reconstruction, and a closed timelike curve would instead represent causal looping. These are not four technologies for doing the same thing; they are four different physical propositions.",[35,2485,2487],{"id":2486},"the-closest-we-already-come-to-travelling-backwards","The closest we already come to travelling backwards",[11,2489,2490],{},"Once the past is treated as a previous physical and informational state, something interesting happens: humans have been reconstructing previous states for thousands of years. Memory does it internally, history does it symbolically, archaeology infers earlier states from surviving physical traces, paintings preserve representations, photography captures information carried by light, film reconstructs moving images and sound, and museums combine surviving matter with reconstructed context.",[11,2492,2493],{},"Games add interaction and virtual reality adds immersion. These technologies can be placed on a continuum of state reconstruction. A sentence about ancient Rome reconstructs relatively little, a historical novel reconstructs considerably more conceptually, film adds audiovisual information, a historically sophisticated game adds spatial interaction and causal possibilities, and virtual reality can add embodiment.",[11,2495,2496,2497,2500],{},"At the far end of that continuum sits one of science fiction's more interesting inventions: the ",[580,2498,2499],{},"Star Trek"," holodeck. Perhaps the holodeck, rather than the DeLorean, is the more physically interesting model of a time machine.",[35,2502,2504],{"id":2503},"amsterdam-1650","Amsterdam, 1650",[11,2506,2507],{},"Imagine asking a sufficiently advanced simulation system to reconstruct Amsterdam in 1650. It reconstructs streets, canals, buildings, weather, clothing, language, sounds and smells. You can walk into a tavern, pick up an object, speak with an inhabitant and continue through the city.",[11,2509,2510],{},"Now add everything we know historically. Known inhabitants receive reconstructed biographies, archaeological evidence constrains buildings and objects, shipping records constrain trade, historical documents constrain politics, religion and social relationships, and environmental evidence constrains weather and ecology. Where information is missing, sufficiently sophisticated models infer plausible states while distinguishing inference from recovered fact.",[11,2512,2513],{},"At some point, the experiential distinction between learning about Amsterdam in 1650 and visiting Amsterdam in 1650 could become remarkably small. Yet nothing travelled backwards. Everything is happening in the present physical configuration, where present physical systems have been arranged to reproduce information and relationships characteristic of an earlier state.",[11,2515,2516],{},"That may be the closest physically plausible approximation of backwards time travel available to us: not transporting ourselves into the past, but reconstructing enough of an earlier physical state in the present that we can interact with it again.",[35,2518,2520],{"id":2519},"reconstruction-eventually-runs-into-information","Reconstruction eventually runs into information",[11,2522,2523],{},"There is an unavoidable limit. To reconstruct an exact historical state, we would need the information constituting that state, and much of it is no longer accessible to us. Photons have escaped into space, documents were destroyed, people died without recording almost everything they experienced, microscopic correlations became distributed throughout environments, and the exact physical state of almost every historical object is unknown.",[11,2525,2526],{},"AI can improve inference enormously, but inference is not recovery. A future simulation might construct an astonishingly accurate Roman marketplace and produce a merchant who behaves exactly as our best historical, archaeological, linguistic and psychological models predict. Wherever the relevant information is inaccessible, however, the simulation must infer rather than recover.",[11,2528,2529],{},"The encounter is a new physical event constrained by surviving information about an earlier world. State reconstruction can therefore approach extraordinary historical fidelity without becoming state restoration.",[35,2531,2533],{"id":2532},"our-brains-already-reconstruct-earlier-states","Our brains already reconstruct earlier states",[11,2535,2536],{},"There is a biological parallel. Human memory is reconstructive. When I remember childhood, my brain does not physically return to its childhood configuration; it changes now into a physical state representing aspects of an earlier state.",[11,2538,2539],{},"Imagining the future works similarly. My brain changes now into a configuration representing a possible subsequent state. Biological cognition therefore already performs primitive versions of historical reconstruction and future simulation, while books, paintings, films, games and virtual reality externalize that capability. AI can increasingly participate in reconstructing missing structure.",[11,2541,2542],{},"A holodeck would be an extreme technological continuation of something brains already do. Notice that throughout this discussion we never needed to imagine the past as a physical destination in order to talk meaningfully about recovering information from it, representing it or recreating aspects of it.",[35,2544,2546],{"id":2545},"putting-the-abstraction-layers-back-in-order","Putting the abstraction layers back in order",[11,2548,2549],{},"We can now return to where we started. There is the physical world: systems, matter, fields, radiation, interactions, locations, trajectories and changing states. There is measurement: choosing reproducible physical processes and comparing their histories with other physical processes. Then there is the mathematical and conceptual framework through which we describe those comparisons: seconds, coordinate time, proper time, worldlines, metrics and spacetime.",[11,2551,2552],{},"The third layer is not a mistake. It is one of the greatest achievements of science. Without abstraction, physics would scarcely be possible. The whole point of a successful abstraction is that we no longer have to repeat the cumbersome underlying description every time. “Gravitational time dilation” is vastly easier to say than a paragraph describing two physical systems, their trajectories, gravitational conditions, signal exchanges and subsequent clock comparisons.",[11,2554,2555],{},"But successful abstractions carry a particular danger: the better the abstraction works, the easier it becomes to mistake the map for the territory. That is particularly easy with time because our language already treats it as an actor. Time flows, passes, slows, catches up with us; we save it, lose it and travel through it. Physics gives some of these expressions precise technical meanings, while ordinary language can quietly give those technical meanings an ontology they never demonstrated.",[35,2557,2559],{"id":2558},"resetting-time-to-its-proper-place","Resetting time to its proper place",[11,2561,2562],{},"This is why I think a useful discipline when discussing time is to reverse the usual explanatory order. Before saying that time slowed down, identify the physical histories being compared. Before saying that gravity affected time, identify the physical systems, their trajectories relative to the surrounding mass-energy distribution, the state changes used as clocks and the procedure through which they were compared.",[11,2564,2565],{},"Before saying that one observer experienced less time, ask which physical processes accompanying the observers accumulated different changes. Before imagining spacetime as a container holding accessible past and future destinations, ask what relationships among physical events and histories the geometry actually represents. And before saying that something travelled into the past, ask whether we mean differential evolution, state restoration, state reconstruction or causal looping.",[11,2567,2568,2569,951,2571,2573],{},"None of these questions weakens relativity. Quite the opposite: once we remove the intuitive baggage carried by words such as ",[580,2570,1559],{},[580,2572,2206],{},", what remains is arguably more remarkable. Physical systems following different histories exhibit universal relationships among their internal processes, and relativity describes those relationships with astonishing precision. A clock is not an observer standing outside this process; it is another changing physical system participating in it, and an observer is not outside it either.",[11,2575,2576],{},"We compare physical change with physical change and one history with another. Time gives us an extraordinarily powerful language for expressing those relationships, and perhaps that is already enough.",[11,2578,2579],{},"Once we keep that hierarchy in mind, even something as fantastic as time travel separates into much clearer physical questions. Travelling into the future means arranging radically different histories of state evolution. Restoring the past would mean reconstructing an earlier physical state with impossible or near-impossible fidelity. A causal loop, if nature permits one at all, would be something different again.",[11,2581,2582],{},"The closest route backwards may therefore turn out not to be a hidden road through a fourth dimension. It may be learning to reconstruct increasingly rich versions of earlier physical states from the traces they left behind. We already do this with memory, history, archaeology, books, photographs, film and simulation, while AI and virtual reality may eventually take us considerably further.",[11,2584,2585,2586],{},"Not backwards through time, but forwards into increasingly convincing reconstructions of what came before. Throughout all of it, the same question remains useful: ",[397,2587,2588],{},"what physically changed, and what did we compare it with?",[35,2590,2592],{"id":2591},"further-reading","Further reading",[11,2594,2595,2596,2603,2604,2611],{},"For the physical definition underlying our measurement of time, the ",[585,2597,2600],{"href":2598,"rel":2599},"https:\u002F\u002Fwww.bipm.org\u002Fen\u002Fsi-base-units\u002Fsecond",[589],[397,2601,2602],{},"BIPM definition of the SI second"," is particularly illuminating. Its ",[585,2605,2608],{"href":2606,"rel":2607},"https:\u002F\u002Fwww.bipm.org\u002Fen\u002Fhistory-si\u002Fsecond",[589],[397,2609,2610],{},"history of the second"," also shows how our reference moved from astronomical processes to increasingly reproducible atomic ones.",[11,2613,2614,2615,2622,2623,2630],{},"For the philosophical background, the ",[585,2616,2619],{"href":2617,"rel":2618},"https:\u002F\u002Fplato.stanford.edu\u002Fentries\u002Ftime\u002F",[589],[397,2620,2621],{},"Stanford Encyclopedia of Philosophy on Time"," provides a broad overview, while its discussion of ",[585,2624,2627],{"href":2625,"rel":2626},"https:\u002F\u002Fplato.stanford.edu\u002Fentries\u002Fleibniz-physics\u002F",[589],[397,2628,2629],{},"Leibniz's philosophy of physics"," explores one of the most influential relational alternatives to Newtonian absolute space and time.",[11,2632,2633,2634,2641],{},"For the experimental side of relativity, ",[585,2635,2638],{"href":2636,"rel":2637},"https:\u002F\u002Fwww.nist.gov\u002Fpublications\u002Frelativity-and-optical-clocks",[589],[397,2639,2640],{},"NIST's work on relativity and optical clocks"," provides a useful route into how gravitational and velocity-dependent differences are actually established through physical clock comparisons.",[11,2643,2644],{},"For readers interested in pushing the relational question considerably further, Carlo Rovelli's work on relational quantum mechanics and time in quantum gravity, and Julian Barbour's work on configuration-based approaches to physics, provide fascinating next steps. Their positions are not identical to the argument made here, but they show just how deep the question of what our temporal concepts represent can become.",{"title":877,"searchDepth":878,"depth":878,"links":2646},[2647,2648],{"id":2180,"depth":881,"text":2181},{"id":2189,"depth":878,"text":2190,"children":2649},[2650,2651,2652,2653,2654,2655,2656,2657,2658,2659,2660,2661,2662,2663,2664,2665,2666,2667,2668,2669,2670,2671,2672],{"id":2193,"depth":881,"text":2194},{"id":2216,"depth":881,"text":2217},{"id":2232,"depth":881,"text":2233},{"id":2252,"depth":881,"text":2253},{"id":2272,"depth":881,"text":2273},{"id":2298,"depth":881,"text":2299},{"id":2311,"depth":881,"text":2312},{"id":2327,"depth":881,"text":2328},{"id":2352,"depth":881,"text":2353},{"id":2368,"depth":881,"text":2369},{"id":2381,"depth":881,"text":2382},{"id":2401,"depth":881,"text":2402},{"id":2414,"depth":881,"text":2415},{"id":2430,"depth":881,"text":2431},{"id":2449,"depth":881,"text":2450},{"id":2466,"depth":881,"text":2467},{"id":2486,"depth":881,"text":2487},{"id":2503,"depth":881,"text":2504},{"id":2519,"depth":881,"text":2520},{"id":2532,"depth":881,"text":2533},{"id":2545,"depth":881,"text":2546},{"id":2558,"depth":881,"text":2559},{"id":2591,"depth":881,"text":2592},"An examination of what clocks, proper time and spacetime physically describe when we compare change with change.","\u002Fimages\u002Fartikelen\u002Ftime-and-relativity\u002Ftime-matters.webp","Two clocks follow different paths through curved spacetime before reuniting for comparison",{},"\u002Fen\u002Farticles\u002Fresetting-time-to-its-proper-place-in-physics-and-beyond",{"title":2175,"description":2673},"en\u002Farticles\u002Fresetting-time-to-its-proper-place-in-physics-and-beyond",[2168,2681,917],"Relativity","time-proper-place","QikLhjgGkobqZsbGPgnZep98egIt_WaMY74ye3DVcUs",{"id":2685,"title":2686,"body":2687,"date":902,"description":3431,"draft":904,"extension":905,"featuredImage":3432,"featuredImageAlt":3433,"meta":3434,"navigation":909,"originalUrl":910,"path":3435,"seo":3436,"stem":3437,"tags":3438,"translationKey":3442,"updated":910,"__hash__":3443},"articlesEn\u002Fen\u002Farticles\u002Fwhats-in-a-note.md","What's in a Note?",{"type":8,"value":2688,"toc":3407},[2689,2694,2698,2701,2704,2707,2711,2718,2721,2724,2728,2731,2734,2737,2744,2748,2751,2754,2757,2760,2763,2767,2770,2773,2776,2779,2782,2786,2789,2792,2799,2806,2809,2813,2816,2819,2822,2825,2828,2832,2835,2846,2856,2859,2863,2866,2881,2884,2888,2891,2894,2897,2900,2904,2911,2914,2917,2921,2937,2943,2946,2952,2956,2959,2966,2969,2973,2976,2979,2982,2985,2989,2992,2998,3001,3004,3007,3010,3014,3021,3024,3031,3035,3038,3045,3048,3052,3055,3058,3061,3064,3067,3071,3074,3077,3080,3083,3087,3090,3096,3102,3108,3114,3120,3126,3132,3145,3151,3157,3161,3164,3171,3181,3183,3199,3216,3232,3249,3269,3281,3296,3316,3336,3353,3373,3390],[11,2690,2691],{},[580,2692,2693],{},"Author's note: This essay grew among others from my recent years of experience in playing and singing in a Tango Orchestra, which required me to learn much more about music notation than I had previously needed. I learnt a lot, had a lot of thoughts about what I learnt, and really wanted to write them down. While writing, I used OpenAI's ChatGPT (GPT-5.6 Sol) as a sparring partner to get the facts right (as much as possible at least) and the structure sound, as well as do a lot of the hard work of actually writing.",[35,2695,2697],{"id":2696},"on-notation-interpretation-and-what-music-asks-of-musicians","On notation, interpretation, and what music asks of musicians",[11,2699,2700],{},"A note on a page seems like a precise thing. It tells us what pitch to play and roughly how long that pitch should last in relation to the notes around it. We can add markings for dynamics, articulation, tempo, phrasing, bowing, fingering and increasingly detailed technical instructions. The more information a score contains, the more tempting it becomes to think that the music itself has now been completely described.",[11,2702,2703],{},"But imagine that Frank Zappa had lived before sound recording. During a concert he improvises one of his guitar solos and someone carefully transcribes it note for note. The performance disappears, but the paper survives. Two hundred years later, guitarists study that same solo. Conservatories teach it, musicologists compare editions and playing a wrong note can cost you points in a competition. Something about this immediately feels strange because we know what improvisation is. Zappa might have played a completely different solo the following evening. The transcription could therefore be perfectly accurate while still giving us a misleading idea of what kind of musical object it preserves. It tells us exactly what someone played at one particular moment, but not necessarily that somebody else should later play exactly the same thing.",[11,2705,2706],{},"That makes an apparently simple question surprisingly interesting: what is actually contained in a note?",[35,2708,2710],{"id":2709},"when-an-improvisation-becomes-a-score","When an improvisation becomes a score",[11,2712,2713,2714,2717],{},"With Keith Jarrett, we do not even need to invent the thought experiment. His famous ",[580,2715,2716],{},"The Köln Concert"," from 1975 was improvised. The music came into existence while he was playing and survived because the performance was recorded. An authorized transcription was published later.",[11,2719,2720],{},"That reverses the direction of the creative process. For Jarrett, the notes were the result of improvisation. For the pianist who later buys the transcription, those same notes become the starting point. What was a musical decision for one musician becomes an instruction for another. Jarrett himself pointed to the limitations of this process. In connection with the authorized transcription, he made clear that the recording should remain the ultimate reference, precisely because some aspects of what happened in Cologne resist complete representation in conventional notation.",[11,2722,2723],{},"That does not make the transcription less valuable. It allows us to study and reconstruct an extraordinary improvisation. But it does show that the same black dot on five lines can represent different kinds of information. Sometimes it means something close to “this should be played.” Sometimes it means “this is what somebody played on this occasion.” The note itself does not tell us which one it is.",[35,2725,2727],{"id":2726},"what-did-not-need-to-be-written-down","What did not need to be written down",[11,2729,2730],{},"Musical notation is not a universal language that appeared in finished form. It developed over centuries. Alongside pitch and rhythm, musicians gradually acquired more ways to indicate dynamics, articulation, tempo, pedaling, bowing and other details.",[11,2732,2733],{},"That does not mean musicians had not been doing those things before they were routinely notated. Often something did not need to be written because an experienced musician within a particular tradition already knew what was expected. The score worked together with knowledge that existed outside the score.",[11,2735,2736],{},"Even familiar symbols have not always been as unambiguous as they appear in modern teaching. Take the hairpins \u003C and >. A student today will usually learn these as crescendo and diminuendo. Research into nineteenth-century performance practice, including David Hyun-Su Kim’s work on Brahms, suggests that in some contexts such markings belonged to a broader expressive gesture in which timing could also play a role. This does not mean that \u003C simply meant “speed up” and > meant “slow down.” It means that a symbol we now associate strongly with one parameter could evoke a richer set of performance conventions for musicians within another culture.",[11,2738,2739,2740,2743],{},"Mozart presents the same problem in a different form. Improvisation was part of the professional skill set of an eighteenth-century keyboard player, and Mozart was renowned for it. In his piano concertos, cadenzas and shorter ",[580,2741,2742],{},"Eingänge"," could provide places where the soloist supplied material. Ornamentation was also shaped by conventions that a competent musician was expected to understand. Historical fidelity can therefore mean two things that overlap strongly without being identical: reproducing as precisely as possible what Mozart wrote, and understanding as well as possible what Mozart expected a good musician to do with what he wrote. The score is essential evidence, but that evidence existed within a performance practice.",[35,2745,2747],{"id":2746},"when-music-became-a-sellable-object-on-paper","When music became a sellable object on paper",[11,2749,2750],{},"There is another historical reason why written music acquired such unusual authority. For centuries, notation was one of the few practical ways to detach a musical creation from the physical presence of the musician, reproduce it at scale, transport it over distance and sell it repeatedly.",[11,2752,2753],{},"Before sound recording, a performance itself could not be copied. A musician could perform again, teach, work for a court or church, or write for a patron, but the sound of one particular evening could not be packaged and sold thousands of times. Written and, eventually, printed music could. With the development of music printing from the early sixteenth century onward, notation became not only a mnemonic and compositional technology but a commercial one. Printed music could circulate through distribution networks similar to those used for books, and by the eighteenth century sheet music had become a substantial commercial product in European cities.",[11,2755,2756],{},"A score was not a recording in the modern sense. It preserved no sound. But before the phonograph, record, tape and digital audio, it was one of the few scalable ways in which a specific musical creation could be separated from the people who made it and reproduced elsewhere.",[11,2758,2759],{},"That matters because media do not preserve all musical information equally well. Pitch relationships, rhythmic structure and harmony transfer relatively well to paper. Microtiming, tone quality, improvisational decisions, physical technique and interaction between musicians do not. The aspects of music that notation could preserve efficiently therefore had an unusually good chance of surviving historically, circulating commercially and becoming objects of study. Printing did not single-handedly create score-centered musical culture, but it created a powerful selection effect: for several centuries, the most portable, reproducible and saleable representation of music was the written one.",[11,2761,2762],{},"Sound recording fundamentally changed that situation. For the first time, one particular performance could itself be reproduced. With Zappa, Jarrett, Troilo, Hendrix, Charlie Parker or Stéphane Grappelli, we can therefore do something impossible with Mozart, Paganini or Liszt: place the written representation beside the actual sounding behavior of the musician and compare the two directly.",[35,2764,2766],{"id":2765},"when-technique-came-before-the-note","When technique came before the note",[11,2768,2769],{},"Liszt and Paganini add another dimension. They were not only composers but exceptional instrumentalists, and their compositions emerged partly from what they had physically discovered on their instruments.",[11,2771,2772],{},"A virtuoso spends years developing a personal technique. Certain movements become easy, new sounds are discovered and new combinations emerge under the hands. Those possibilities become part of the musician’s language and eventually find their way into compositions. For the next generation, the process runs in the opposite direction. The student first receives the end result on paper and then has to develop the technique required to reproduce it.",[11,2774,2775],{},"Paganini makes this especially tangible. His violin music employs harmonics, multiple stops, left-hand pizzicato and unusual bowing techniques. He was also an accomplished guitarist, and researchers have explored guitar-like idioms in his violin writing. For Paganini, a musical idea could therefore grow out of something he had discovered with his hands. A violinist two hundred years later first encounters the notes and is then asked to develop the hands necessary to execute Paganini’s solution.",[11,2777,2778],{},"This is enormously valuable. Difficult music forces us to acquire techniques we might never have discovered ourselves. But it also shows that a written note can be the end product of years of physical development. Notation preserves the result much more easily than the process that produced it.",[11,2780,2781],{},"With Jimi Hendrix, this seems almost obvious. A detailed transcription can preserve pitches, rhythms, bends and articulations, but his musical language emerged from the interaction between his hands, the electric guitar, amplifier, distortion, feedback, vibrato and tremolo system. The written pitch is a trace of a much larger physical and technological event.",[35,2783,2785],{"id":2784},"the-same-symbol-a-different-instrument","The same symbol, a different instrument",[11,2787,2788],{},"Even when musicians read exactly the same symbol, it does not necessarily describe the same physical action. A pianist cannot make a single piano tone grow louder after the hammer has struck the string. A violinist can increase the intensity of a sustained note, while a bandoneon player can shape it through the bellows. A crescendo across a long note therefore requires fundamentally different physical solutions on these instruments.",[11,2790,2791],{},"The same is true of legato and staccato. A violinist can physically connect several notes within one bow stroke. A pianist creates the impression of connection through attack, release, overlap and sometimes pedal. On bandoneon, fingers, articulation and bellows movement interact in yet another way. The symbol can describe a musical intention without completely specifying its realization.",[11,2793,2794,2795,2798],{},"Tango sometimes makes this very concrete. The ",[580,2796,2797],{},"marcato"," has developed into a highly distinctive articulation: often extremely short and percussive, with a dry attack that can feel almost like striking a match. On bandoneon, that character is produced not only with the fingers but through the bellows and the body of the instrument itself. Players commonly use a sharp bellows impulse supported by a bounce on the leg, producing an accent that is difficult to reproduce with quite the same physical mechanism and attack on an accordion.",[11,2800,2801,2802,2805],{},"Or consider a percussive violin effect such as ",[580,2803,2804],{},"tambor",". Its identity lies at least as much in the physical gesture and resulting timbre as in the written pitch. The effect is produced by making the string strike against a stopped finger, creating a dry, drum-like sound. At the same time, the result is not acoustically pitchless: changing where the gesture is produced also changes its resonance and pitch content.",[11,2807,2808],{},"The useful question is therefore not whether the written note may simply be ignored. It is what that note is specifying. Is absolute pitch essential? Is the notation partly indicating a conventional physical way of producing the sound? Is it describing an effect or a function? Or is ordinary pitch notation simply the most convenient available way to represent something more complex? At that point, the question shifts from what is written to why it is written.",[35,2810,2812],{"id":2811},"jazz-less-on-the-page-more-in-the-musician","Jazz: less on the page, more in the musician",[11,2814,2815],{},"Jazz offers an illuminating comparison because it developed a very different relationship with notation. A jazz ensemble can construct an extraordinarily sophisticated performance from remarkably little written information. A lead sheet may contain melody, chord symbols and form. In many contemporary playing situations, a musician may have little more than a chord chart on a tablet, more often than not these days with an app on a phone or a tablet, allowing them to change the key quickly if the other musicians require it.",[11,2817,2818],{},"Yet the music is not correspondingly simple. Much of its information has simply moved somewhere else: into the musicians.",[11,2820,2821],{},"A chord symbol does not prescribe a complete piano part. It describes a harmonic situation within which the pianist chooses voicing, register, rhythm, density and color. The bassist constructs a line that supports harmony and pulse. The drummer uses a learned rhythmic language while responding continuously to the ensemble. A soloist creates new melodic material within a form that everyone must keep internally.",[11,2823,2824],{},"This is why a Charlie Parker transcription occupies such an interesting position. A saxophonist may spend months learning one of Parker’s solos note for note. That can be an extraordinary way to study articulation, harmony, rhythm and melodic construction. But nobody concludes that every future performance of the tune should contain Parker’s exact solo. The transcription is evidence of how one exceptional musician solved a musical problem. The student reproduces the solution in order to learn the language behind it.",[11,2826,2827],{},"Jazz therefore provides a useful counterexample to the idea that precision necessarily requires more written information. A performance can be highly disciplined while leaving enormous freedom to the musicians, provided they share enough harmonic, rhythmic and stylistic knowledge to make meaningful decisions.",[35,2829,2831],{"id":2830},"jazz-and-tango-two-modern-urban-languages","Jazz and tango: two modern urban languages",[11,2833,2834],{},"Jazz and tango also make an interesting historical pair. Both developed as urban popular musics around the turn of the twentieth century and underwent enormous transformations during the era of records, radio, dance halls and expanding international mass culture.",[11,2836,2837,2838,2841,2842,2845],{},"They were not isolated from each other. Jazz was heard in Buenos Aires, tango travelled internationally, and musicians operated in a world in which different forms of dance music circulated rapidly. Research on the early recording industry shows that American jazz, tango and other popular genres shared commercial and cultural networks, while tango’s modernization during the ",[580,2839,2840],{},"Guardia Nueva"," unfolded in a world increasingly familiar with jazz harmony, instrumentation and orchestration. Osvaldo Fresedo provides a particularly tangible example of these connections. He had encountered American popular music during an early visit to the United States and incorporated instruments and colors associated with jazz into his own orchestral experiments. Then, in 1956, the connection became quite literal: during Dizzy Gillespie’s visit to Buenos Aires, Gillespie joined Fresedo’s orchestra at the Rendez Vous nightclub. A recording survives of Fresedo’s famous tango ",[580,2843,2844],{},"Vida mía"," with Gillespie improvising on trumpet over the orchestra — an almost perfect meeting, in sound, of the two traditions discussed here.",[11,2847,2848,2849,2852,2853,2855],{},"It would nevertheless be too simple to say that the tango ",[580,2850,2851],{},"variación"," developed from the jazz solo. Their musical functions are different. In jazz, improvisation became a central mechanism through which an individual musician could create new melodic material over an existing harmonic and formal structure. In tango, a ",[580,2854,2851],{}," is more specifically a transformation or intensification of thematic material, often highly virtuosic and frequently associated with the bandoneons. It may be composed, arranged or shaped through performance practice rather than freely improvised.",[11,2857,2858],{},"The comparison is more interesting without forcing a direct genealogy. Jazz and tango were two living musical cultures confronting some of the same possibilities: individual musicians, shared stylistic languages, ensemble interaction, increasingly sophisticated arrangements and, crucially, the new possibility of preserving performances through recording. That last point distinguishes both traditions from Mozart’s world. We do not have to infer how Charlie Parker placed a phrase, how Troilo attacked a note or how Grappelli shaped a violin line solely from notation; we can listen.",[35,2860,2862],{"id":2861},"tango-when-a-small-amount-of-notation-carries-a-lot-of-information","Tango: when a small amount of notation carries a lot of information",[11,2864,2865],{},"The relationship between written information and internalized knowledge is particularly visible in Argentine tango. I once played with a quartet from Argentina that used only a few letters in the parts to indicate different ways a measure should be played. I no longer remember the exact abbreviations, but for the musicians those brief indications were sufficient. Behind a few letters lay an entire performance practice they already knew.",[11,2867,2868,2869,1518,2871,1518,2874,1518,2877,2880],{},"Tango has a shared vocabulary of rhythmic models and playing conventions, including ",[580,2870,2797],{},[580,2872,2873],{},"síncopa",[580,2875,2876],{},"arrastre",[580,2878,2879],{},"yumba"," and many instrument-specific effects. Musicians who know that language do not need every physical action written out. A short indication can invoke an entire performance model.",[11,2882,2883],{},"In this respect, the tango marking and the jazz chord symbol perform a similar informational trick: they compress a large amount of musical knowledge into a small amount of notation. The amount of information in a score therefore cannot be measured simply by counting symbols. A few letters can tell an experienced musician a great deal and an outsider almost nothing. The missing information has not disappeared; it exists in the performance tradition.",[35,2885,2887],{"id":2886},"the-same-notes-can-become-a-different-orchestra","The same notes can become a different orchestra",[11,2889,2890],{},"The great tango orchestras demonstrate how much different music can emerge from broadly similar raw materials. D’Arienzo, Di Sarli, Troilo, Pugliese, Fresedo and other bandleaders worked with the same basic instrumental families, a shared rhythmic vocabulary and often the same repertoire. Yet their orchestras can be distinguished within a few measures.",[11,2892,2893],{},"Bassist, producer and tango educator Ignacio Varchausky has done extensive work analyzing these differences. His approach looks beyond which notes an orchestra plays to rhythmic models, articulation, dynamics, texture, melodic treatment, instrumental functions and the personalities of individual players. In his work on Di Sarli, he explicitly emphasizes the difference between what is played and how it is played.",[11,2895,2896],{},"That “how” cannot be separated entirely from the people in the orchestra. Carlos Di Sarli and Osvaldo Pugliese were both pianists, and the piano acquired an important organizing function in both orchestras, but with very different results. Di Sarli’s broad melodic treatment and remarkable string sound are central to his orchestral identity. Pugliese and his musicians developed a much more elastic language of rhythm, dynamics, rubato and tension. Juan D’Arienzo was a violinist, yet the distinctive rhythmic identity of his orchestra also depended heavily on musicians around him, including pianists such as Rodolfo Biagi.",[11,2898,2899],{},"An orchestral style is therefore better understood as a system of musical choices than as a collection of prescribed notes. An arrangement is also a system of choices. It records one solution to questions of balance, rhythm, register, instrumentation, texture and musical hierarchy. Understanding those choices makes it possible not only to reproduce them but also to reconsider them when the musicians or circumstances change.",[35,2901,2903],{"id":2902},"fraseo-when-the-correct-notes-are-still-not-enough","Fraseo: when the correct notes are still not enough",[11,2905,2906,2907,2910],{},"One important tango concept is ",[580,2908,2909],{},"fraseo",". Simply translating it as “phrasing” does not quite capture it. A tango melody can play systematically with time. Notes and groups of notes may be stretched, shortened or displaced relative to the underlying pulse while their relationship to that pulse remains musically intelligible.",[11,2912,2913],{},"Researchers have measured such timing differences in historical tango performances. They are not simply sloppy rhythm or vague expression. The deviations can be systematically related to melody, form and style. You can therefore play all the correct pitches and written note values and still sound very little like Troilo. A significant part of the musical information lies in where the notes actually occur in time.",[11,2915,2916],{},"Here Jarrett, jazz and tango meet. Metric notation can be accurate without being exhaustive.",[35,2918,2920],{"id":2919},"when-a-variación-becomes-fixed","When a variación becomes fixed",[11,2922,2923,2924,2926,2927,2929,2930,2932,2933,2936],{},"The tango ",[580,2925,2851],{}," provides an almost ironic example of what can happen when living musical decisions become repertoire. In many instrumental tangos, a ",[580,2928,2851],{}," provides a virtuosic transformation or intensification of thematic material, often in rapid sixteenth notes and frequently played by the bandoneons. It also has a practical significance on the dance floor. Because the ",[580,2931,2851],{}," so often appears towards the end of a tango, its sudden increase in rhythmic density and energy has become a familiar cue to dancers that the end is approaching. Experienced dancers can hear the orchestra moving into its final stretch and prepare the shape and energy of their dancing accordingly. This is not a fixed rule — ",[580,2934,2935],{},"variaciones"," can also occur elsewhere in a piece — but it is another example of musical information that is immediately meaningful to someone who knows the language, even though nothing in the individual notes says “the end is coming.”",[11,2938,2939,2940,2942],{},"Not every historical ",[580,2941,2851],{}," was freely improvised. Some were composed, some arranged and others were shaped around particular players or performance practices. What becomes interesting is what happens afterwards. A passage whose very purpose is to vary existing material can become famous, be written down and then be learned note for note by later generations. A particular solution becomes repertoire in its own right.",[11,2944,2945],{},"Compare that with Charlie Parker. His improvised solo can also be transcribed and reproduced exactly. But jazz pedagogy generally treats that reproduction as a route towards understanding Parker’s language rather than as the required solo for every future performance.",[11,2947,2948,2949,2951],{},"The comparison suggests a useful question for tango pedagogy as well. Learning a historical ",[580,2950,2851],{}," exactly can be enormously valuable technically and stylistically. But after learning it, we can also ask what the passage is doing. Is it increasing tension, intensifying the rhythm, transforming the theme, exploiting register or driving towards a climax? Once that function is understood, the same musical problem can be approached with different material.",[35,2953,2955],{"id":2954},"a-note-also-has-a-role","A note also has a role",[11,2957,2958],{},"Within an ensemble, a note acquires another property: it has a function in relation to the other voices. Tango makes this particularly easy to hear. The melody may move from one instrument or section to another within a single arrangement. At first the violin may carry the melody while piano and bandoneons accompany it. A few measures later the bandoneons take over and the violin becomes a second voice, an answer or part of the rhythmic texture.",[11,2960,2961,2962,2965],{},"Dynamics are therefore relational. ",[580,2963,2964],{},"Forte"," is not a fixed number of decibels. Four violins against two bandoneons create a different balance from one violin against four bandoneons, even if the parts contain identical dynamic markings. But numbers alone are not enough either. If one violin has the melody while four bandoneons accompany it, four instruments may collectively need to make room for one. A few measures later the bandoneons may take over the melody and the relationship reverses.",[11,2967,2968],{},"A musician who concentrates exclusively on their own part can therefore play everything correctly while producing the wrong musical result. The player needs to understand who currently carries the melody, who answers it, who has a second voice, who supports the harmony, who establishes the pulse and who should build tension or create space. When the musical roles move, the relationships between the players must move with them.",[35,2970,2972],{"id":2971},"the-piano-working-backwards-from-notes-to-harmony","The piano: working backwards from notes to harmony",[11,2974,2975],{},"The piano reveals another side of the same idea. A tango piano part can be written out completely note for note, but much of what appears on the page can also be understood through the underlying chords, the function of the part and familiar rhythmic and technical conventions.",[11,2977,2978],{},"A pianist who learns only the written part knows what is played in this particular version. A pianist who also understands the harmonic structure, accompaniment model and reasons behind particular voicings, bass lines and rhythmic figures understands where those notes came from.",[11,2980,2981],{},"That difference matters when the situation changes. If the double bass takes over the bass function more strongly, perhaps the pianist can play less. If the bandoneons are already supplying substantial rhythmic information, the piano can create space. If something disappears from the ensemble, the pianist may take on more responsibility.",[11,2983,2984],{},"The written part can therefore be understood as one implementation of an underlying musical model. If you know the implementation, you can reproduce it. If you understand the model, you can adapt it.",[35,2986,2988],{"id":2987},"the-singer-makes-the-problem-visible","The singer makes the problem visible",[11,2990,2991],{},"We tend to expect something different from a tango singer than from the instrumentalists. The singer is generally expected to have internalized the words and melody. A singer continually reading from a score during a performance would seem unusual in many tango contexts, while instrumentalists sitting behind stands with fully written parts are easily accepted.",[11,2993,2994,2995,2997],{},"Yet the singer is precisely the person to whom the orchestra needs to respond. A singer may delay words, push phrases forward, take space and develop an individual ",[580,2996,2909],{},". A good accompanying orchestra must be able to follow and support that.",[11,2999,3000],{},"Even the key becomes a musical choice. For a singer, the issue is not simply the highest and lowest note. Tessitura matters: where does most of the melody lie, where are the climaxes and how do they relate to the register transitions of this particular voice?",[11,3002,3003],{},"The ideal key for the singer, however, is not automatically the easiest key for the orchestra. On violin, open strings, resonance and fingerings change. On piano, patterns fall differently under the hands. On bandoneon, transposition can have significant consequences for fingering, register and bellows organization. A passage that feels natural in one key may become considerably more awkward a semitone or tone away.",[11,3005,3006],{},"Arranging therefore becomes a search for an optimum. Perhaps the orchestra accepts a more difficult key because the singer sounds dramatically better in it. Perhaps several keys work vocally and the musicians choose the one that works best instrumentally. Perhaps some voicings and accompaniment figures are redesigned rather than mechanically transposed.",[11,3008,3009],{},"A rigid orchestra forces the singer to adapt to the arrangement. A flexible orchestra can investigate how the arrangement can best support this singer.",[35,3011,3013],{"id":3012},"a-la-parrilla-when-musicians-distribute-the-functions-themselves","A la parrilla: when musicians distribute the functions themselves",[11,3015,3016,3017,3020],{},"With ",[580,3018,3019],{},"tocar a la parrilla",", much of this becomes explicit. Musicians play without a fully written arrangement, perhaps using no written music at all or working from a simple lead sheet containing little more than melody, chords and form. They draw on a shared tango language of melodic treatment, rhythmic models, articulations, fills and familiar instrumental gestures. The written information may therefore be remarkably sparse, but that does not mean the arrangement is absent. Much of it is being created by the musicians themselves, using knowledge they already share.",[11,3022,3023],{},"This is not simply tango’s version of a jazz jam session. The languages and conventions are different. But both practices demonstrate how an ensemble can function when the musicians possess enough shared knowledge to make decisions that the notation does not make for them.",[11,3025,3026,3027,3030],{},"Who has the melody? Who supports the harmony? Where does the pulse come from? Is there room for a countermelody? Is the texture becoming too crowded? Who takes over a function when somebody else stops playing? A written arrangement can answer many of these questions in advance. ",[580,3028,3029],{},"A la parrilla"," forces the musicians to answer them while playing.",[35,3032,3034],{"id":3033},"what-two-musicians-can-preserve-from-an-orchestra","What two musicians can preserve from an orchestra",[11,3036,3037],{},"The duo Los Suplentes, guitarist Emiliano Faryna and bandoneonist Hugo Satorre, provides a useful modern example. They translate characteristic sounds and articulations of historical dance orchestras into music for just guitar and bandoneon. Their arrangements are developed orally, without written scores, and leave room for improvisation.",[11,3039,3040,3041,3044],{},"Two musicians cannot reproduce every part of an ",[580,3042,3043],{},"orquesta típica",". Choosing becomes unavoidable. At one moment the guitar may suggest rhythm, bass and harmony while the bandoneon carries the melody. Later those functions can shift. Some inner voices disappear completely, while a characteristic rhythmic gesture may prove essential.",[11,3046,3047],{},"The result does not have to sound like an incomplete orchestra. Through the act of choosing, a distinct ensemble sound emerges. This is one of the clearest examples of the difference between reduction and realization. The question is not how many orchestral notes two people can retain, but what musical information is needed for the tango to work convincingly with two musicians.",[35,3049,3051],{"id":3050},"what-happens-when-the-score-also-becomes-the-curriculum","What happens when the score also becomes the curriculum?",[11,3053,3054],{},"A developing musician can understand much more musically than their hands are capable of executing. On violin this is painfully obvious: even producing a beautiful sustained note requires considerable coordination. Add shifts, double stops, difficult bow strokes and ornamentation, and years may pass before a particular written realization becomes technically comfortable.",[11,3056,3057],{},"The obvious response is to practise, and rightly so. If you cannot execute a bow stroke, chord or shift, that is a good reason to learn it. Difficult repertoire is valuable precisely because it forces us to acquire possibilities we might never have discovered ourselves.",[11,3059,3060],{},"But that does not have to be the only response. At the same time, we can ask what we can already make of the music today. Perhaps we play the melody without every double stop. Perhaps we simplify a run but preserve its harmonic destination and arrive at the important next note in time. Perhaps we remove inner voices while retaining melody, pulse, harmony and character.",[11,3062,3063],{},"Six months later, more technique is available and the realization can become richer. Eventually we may be able to play the original version exactly. That can itself be a form of homage: we have developed our technique far enough to understand another musician’s solution literally with our own hands.",[11,3065,3066],{},"Adaptation and technical development are not opposites. One allows us to make music with the abilities we possess today; the other increases the possibilities we will possess tomorrow.",[35,3068,3070],{"id":3069},"not-less-reading-but-more-understanding","Not less reading, but more understanding",[11,3072,3073],{},"None of this is an argument against reading music well. Fluent sight-reading is an enormous skill. It allows musicians to understand new music quickly, learn repertoire faster and sometimes join an ensemble immediately without first spending days studying the piece.",[11,3075,3076],{},"The more interesting distinction is between the score as information and the score as complete instruction. A versatile musician can read that information quickly while also understanding what it is doing musically. They can reproduce a part exactly when that is required, but they can also hear when another voice is more important, notice that the instrumentation has changed, simplify a passage without losing its structure, respond to a singer and adapt when the musical situation demands it.",[11,3078,3079],{},"Jazz makes the same point from the opposite direction. A player may have only a chord symbol in front of them, but that does not make the task easier. It may require more harmonic, rhythmic and stylistic information to be carried internally.",[11,3081,3082],{},"The ideal is therefore neither dependence on notation nor rejection of notation. It is to have as much information available as possible — on the page, in the ear, in the hands and in our understanding of the music — and to know how to use it.",[35,3084,3086],{"id":3085},"how-can-we-practise-this","How can we practise this?",[11,3088,3089],{},"These skills can be trained deliberately without replacing technical study, repertoire work or sight-reading.",[11,3091,3092,3095],{},[397,3093,3094],{},"Remove information."," Take a familiar piece and play only the melody. Add the bass, then only the most important harmonic events. Deliberately remove material while keeping the structure and character recognizable. This reveals which information is essential and which belongs to one particular realization.",[11,3097,3098,3101],{},[397,3099,3100],{},"Simplify without stopping."," Play a technically difficult passage in tempo and, if necessary, remove double stops, inner voices or intermediate notes. Preserve the pulse, important melodic points and harmonic destinations.",[11,3103,3104,3107],{},[397,3105,3106],{},"Learn a difficult passage in two directions."," First find a way to realize it convincingly with the technique you have today. Then identify precisely which technical ability prevents you from playing the written version and practise that separately.",[11,3109,3110,3113],{},[397,3111,3112],{},"Work backwards from the chords."," Take a fully written accompaniment and analyze its harmony, bass function and rhythmic model. Put the part away and build a new accompaniment from that information. Then compare your solution with the written arrangement.",[11,3115,3116,3119],{},[397,3117,3118],{},"Exchange functions."," In an ensemble, deliberately move the melody from one instrument to another. The other players must adjust dynamics, articulation and density without receiving newly written parts.",[11,3121,3122,3125],{},[397,3123,3124],{},"Build an arrangement from incomplete information."," Give an ensemble only melody, harmony and form. Let the musicians decide who supplies melody, bass, rhythm, second voice and fills. Then remove a player and keep the music working.",[11,3127,3128,3131],{},[397,3129,3130],{},"Reduce an orchestra to a duo."," Take a short passage from an orchestral arrangement and make it convincing with two instruments. You cannot preserve everything, so decide which functions are essential.",[11,3133,3134,1402,3137,3141,3142,3144],{},[397,3135,3136],{},"Make your own",[580,3138,3139],{},[397,3140,2851],{},"**.** Take a melodic fragment and use your current technique to increase rhythmic density, transform the melody or move towards a climax. Then learn a historical ",[580,3143,2851],{}," and compare the solutions.",[11,3146,3147,3150],{},[397,3148,3149],{},"Treat a transcription as a lesson, not a command."," Learn a Parker solo, a Grappelli phrase, a Troilo passage, a Hendrix gesture or a Zappa solo as accurately as possible. Study its timing, articulation, harmony, sound and technique. Then put the transcription away and create something different using principles you discovered in it.",[11,3152,3153,3156],{},[397,3154,3155],{},"Practise playing less."," Remove increasing amounts of material from an arrangement. When does the music become clearer? When does something essential disappear? Learn to distinguish a place where you can play from a place where the music actually needs you to play.",[35,3158,3160],{"id":3159},"so-what-is-in-a-note","So what is in a note?",[11,3162,3163],{},"A note can contain a surprising amount. It can be an instruction, carry a harmonic or melodic function, preserve an improvisatory decision, or record the result of a technique that a musician spent years developing. At the same time, a note can only contain what notation is capable of containing. Timing, sound, physical technique, interaction and stylistic knowledge can be represented on paper only partially.",[11,3165,3166,3167,3170],{},"None of this makes the score less important. On the contrary, it can be music to perform, historical evidence to investigate, and a record of musical decisions from which we can learn. But once we recognize that the notes in front of us are sometimes the ",[397,3168,3169],{},"outcome"," of a creative process, we can also try to read that process backwards. We can ask not only what somebody played, but why it worked.",[11,3172,3173,3174,3177,3178],{},"The question ",[397,3175,3176],{},"“what is written?”"," therefore remains essential. It simply does not have to be the final question. We can follow it with another: ",[397,3179,3180],{},"what does the music need from the musicians who are playing it now?",[35,3182,2042],{"id":2041},[11,3184,3185,1402,3188,3192,3193],{},[397,3186,3187],{},"Keith Jarrett —",[580,3189,3190],{},[397,3191,2716],{},"**, authorized transcription, Schott Music.** Useful for the unusual case of a fully improvised performance later becoming an authorized score, and for Jarrett’s own reservations about the limits of transcription. ",[585,3194,3197],{"href":3195,"rel":3196},"https:\u002F\u002Fwww.schott-music.com\u002Fen\u002Fthe-koeln-concert-no38222.html",[589],[397,3198,3195],{},[11,3200,3201,1402,3204,3209,3210],{},[397,3202,3203],{},"Julián Graciano — “Tango and Jazz: Cross-Genre Relations in History and Practice,” in",[580,3205,3206],{},[397,3207,3208],{},"The Cambridge Companion to Tango","**.** Particularly relevant to the historical relationship between jazz and tango, improvisation, spontaneity and the use of reduced notation such as lead sheets. ",[585,3211,3214],{"href":3212,"rel":3213},"https:\u002F\u002Fwww.cambridge.org\u002Fcore\u002Fbooks\u002Fabs\u002Fcambridge-companion-to-tango\u002Ftango-and-jazz-crossgenre-relations-in-history-and-practice\u002F86A6D96F1A5A13FBFE4F00AEAB3E78B8",[589],[397,3215,3212],{},[11,3217,3218,1402,3221,3225,3226],{},[397,3219,3220],{},"Ignacio Varchausky & Adam Tully — “Orchestral Rhythmic Designs and Performance Practices: Juan D’Arienzo and Aníbal Troilo,” in",[580,3222,3223],{},[397,3224,3208],{},"**.** A useful scholarly treatment of rhythmic language and performance practice in two major tango orchestras. ",[585,3227,3230],{"href":3228,"rel":3229},"https:\u002F\u002Fwww.cambridge.org\u002Fcore\u002Fbooks\u002Fcambridge-companion-to-tango\u002F3BC7F58C563B0BEA422B3BEB71DE1065",[589],[397,3231,3228],{},[11,3233,3234,1402,3237,3242,3243],{},[397,3235,3236],{},"Ignacio Varchausky —",[580,3238,3239],{},[397,3240,3241],{},"Los Estilos Fundamentales del Tango","**.** Varchausky’s educational material on Di Sarli, D’Arienzo, Troilo and Pugliese is especially useful for hearing style as a combination of rhythmic models, instrumental functions, articulation, texture, dynamics and individual musicians rather than as notation alone. ",[585,3244,3247],{"href":3245,"rel":3246},"https:\u002F\u002Fwww.ignaciovarchausky.com\u002F",[589],[397,3248,3245],{},[11,3250,3251,1402,3254,1402,3259,3262,3263],{},[397,3252,3253],{},"Andrés Serafini — “Pichuco y su ‘goma de borrar’: diferencias entre texto y ejecución en un tango arreglado por Astor Piazzolla para la orquesta típica de Aníbal Troilo,”",[580,3255,3256],{},[397,3257,3258],{},"Revista Argentina de Musicología",[397,3260,3261],{},"19."," A particularly concrete case study comparing a surviving written arrangement with Troilo’s recorded execution. ",[585,3264,3267],{"href":3265,"rel":3266},"https:\u002F\u002Fojs.aamusicologia.ar\u002Findex.php\u002Fram\u002Fes\u002Farticle\u002Fview\u002F270",[589],[397,3268,3265],{},[11,3270,3271,3274,3275],{},[397,3272,3273],{},"Todo Tango — “Listening to Tango Dance Music: A Beginner’s Guide.”"," A practical listening introduction to the different layers of tango performance, including rhythm, melody and contrasting uses of the bandoneon. ",[585,3276,3279],{"href":3277,"rel":3278},"https:\u002F\u002Fwww.todotango.com\u002Fenglish\u002Fhistory\u002Fchronicle\u002F448\u002FListening-to-tango-dance-music-A-beginners-guide\u002F",[589],[397,3280,3277],{},[11,3282,3283,3286,3287,3289,3290],{},[397,3284,3285],{},"Los Suplentes — Emiliano Faryna & Hugo Satorre."," Guitar and bandoneon provide a useful practical example of reducing the resources of the ",[580,3288,3043],{}," while preserving and reinterpreting its musical functions. Their own descriptions and live performances are particularly valuable because the duo develops arrangements orally and leaves room for improvisation. ",[585,3291,3294],{"href":3292,"rel":3293},"https:\u002F\u002Fhugosatorre.com.ar\u002F",[589],[397,3295,3292],{},[11,3297,3298,1402,3301,1402,3306,3309,3310],{},[397,3299,3300],{},"Jessica Dauterive, Matthew B. Karush & Michael O’Malley — “Hearing the Americas: Understanding the Early Recording Industry with Digital Tools,”",[580,3302,3303],{},[397,3304,3305],{},"Journal of the Gilded Age and Progressive Era",[397,3307,3308],{},"(2023)."," Useful historical context for the early recording industry and the international circulation of popular music in the Americas. ",[585,3311,3314],{"href":3312,"rel":3313},"https:\u002F\u002Fwww.cambridge.org\u002Fcore\u002Fjournals\u002Fjournal-of-the-gilded-age-and-progressive-era\u002Farticle\u002Fhearing-the-americas-understanding-the-early-recording-industry-with-digital-tools\u002F32F846C800B73D93ACC78B01949F1FE4",[589],[397,3315,3312],{},[11,3317,3318,1402,3321,1402,3326,3329,3330],{},[397,3319,3320],{},"David Hyun-Su Kim — “The Brahmsian Hairpin,”",[580,3322,3323],{},[397,3324,3325],{},"19th-Century Music",[397,3327,3328],{},"36, no. 1 (2012), 46–57."," An illuminating study of nineteenth-century hairpins and the possibility that such markings communicated a broader expressive practice than a purely modern dynamic reading suggests. ",[585,3331,3334],{"href":3332,"rel":3333},"https:\u002F\u002Fonline.ucpress.edu\u002Fncm\u002Farticle-abstract\u002F36\u002F1\u002F46\u002F69638\u002FThe-Brahmsian-Hairpin",[589],[397,3335,3332],{},[11,3337,3338,1402,3341,3346,3347],{},[397,3339,3340],{},"Frederick Neumann —",[580,3342,3343],{},[397,3344,3345],{},"Ornamentation and Improvisation in Mozart","**.** A substantial study of ornamentation, unwritten additions and improvisatory performance practice in Mozart. ",[585,3348,3351],{"href":3349,"rel":3350},"https:\u002F\u002Fwww.degruyter.com\u002Fdocument\u002Fdoi\u002F10.1515\u002F9780691194684\u002Fhtml",[589],[397,3352,3349],{},[11,3354,3355,1402,3358,1402,3363,3366,3367],{},[397,3356,3357],{},"Dana Gooley —",[580,3359,3360],{},[397,3361,3362],{},"Fantasies of Improvisation: Free Playing in Nineteenth-Century Music",[397,3364,3365],{},"(Oxford University Press, 2018)."," Useful for understanding the changing relationship between virtuoso, improviser, composer, performer and the concept of the musical work in the nineteenth century. ",[585,3368,3371],{"href":3369,"rel":3370},"https:\u002F\u002Facademic.oup.com\u002Fbook\u002F25754",[589],[397,3372,3369],{},[11,3374,3375,1402,3378,3383,3384],{},[397,3376,3377],{},"Tim Carter — “Music-printing in late sixteenth- and early seventeenth-century Florence,”",[580,3379,3380],{},[397,3381,3382],{},"Early Music History","**.** Useful background on the commercialization of music printing and the development of printed music as a marketable product. ",[585,3385,3388],{"href":3386,"rel":3387},"https:\u002F\u002Fwww.cambridge.org\u002Fcore\u002Fjournals\u002Fearly-music-history\u002Farticle\u002Fabs\u002Fmusicprinting-in-late-sixteenth-and-early-seventeenthcentury-florence-giorgio-marescotti-cristofano-marescotti-and-zanobi-pignoni\u002FCFA08F6021E7D7D338736EDDF43AD565",[589],[397,3389,3386],{},[11,3391,3392,1402,3395,3400,3401],{},[397,3393,3394],{},"Rupert Ridgewell — “Inside a Viennese Kunsthandlung: Artaria in 1784,” in",[580,3396,3397],{},[397,3398,3399],{},"Consuming Music","**.** A useful view of the commercial world of printed music in Mozart-era Vienna. ",[585,3402,3405],{"href":3403,"rel":3404},"https:\u002F\u002Fwww.cambridge.org\u002Fcore\u002Fbooks\u002Fconsuming-music\u002Finside-a-viennese-kunsthandlung-artaria-in-1784\u002FD4CA01B497A5953DD477E1E0BD435FB1",[589],[397,3406,3403],{},{"title":877,"searchDepth":878,"depth":878,"links":3408},[3409,3410,3411,3412,3413,3414,3415,3416,3417,3418,3419,3420,3421,3422,3423,3424,3425,3426,3427,3428,3429,3430],{"id":2696,"depth":881,"text":2697},{"id":2709,"depth":881,"text":2710},{"id":2726,"depth":881,"text":2727},{"id":2746,"depth":881,"text":2747},{"id":2765,"depth":881,"text":2766},{"id":2784,"depth":881,"text":2785},{"id":2811,"depth":881,"text":2812},{"id":2830,"depth":881,"text":2831},{"id":2861,"depth":881,"text":2862},{"id":2886,"depth":881,"text":2887},{"id":2902,"depth":881,"text":2903},{"id":2919,"depth":881,"text":2920},{"id":2954,"depth":881,"text":2955},{"id":2971,"depth":881,"text":2972},{"id":2987,"depth":881,"text":2988},{"id":3012,"depth":881,"text":3013},{"id":3033,"depth":881,"text":3034},{"id":3050,"depth":881,"text":3051},{"id":3069,"depth":881,"text":3070},{"id":3085,"depth":881,"text":3086},{"id":3159,"depth":881,"text":3160},{"id":2041,"depth":881,"text":2042},"On notation, interpretation and the difference between what music records, prescribes and asks musicians to create.","\u002Fimages\u002Fartikelen\u002Fwhats-in-a-note\u002Fwhats-in-a-note.webp","A visual collage connecting musical notation, improvisation, jazz, tango and instrumental performance",{},"\u002Fen\u002Farticles\u002Fwhats-in-a-note",{"title":2686,"description":3431},"en\u002Farticles\u002Fwhats-in-a-note",[3439,3440,3441],"Music","Notation","Interpretation","whats-in-a-note","XNI0khVe5l1Xi3r6cK_JyEz5l0eD72jWK8R-k1xLTv4",1789131821752]