Western thought has never really listened to instability. Over more than two millennia, the philosophical tradition has shaped its foundations around a silent refusal: to recognize imbalance as a structuring condition of reality. The origin of the cosmos, of order, of being itself was, from the first gestures of Greek thought, conceived as a passage - often teleological - from chaos to form, from the formless to the ordered. And even when chaos was admitted to the margins of discourse, it was almost always to be overcome, tamed, or functionalized. Instability has not, in most traditions, had the status of an autonomous ontological regime. This text proposes a diagnosis: not just pointing out this refusal, but understanding its structure, its persistence and its consequence for the foundation of an ontology of complexity.
Let's start with the Greeks. In the archaic tradition, khaos, as it appears in Hesiod's Theogony, designates not modern "chaos" - an explosion of disorder - but a primordial void, an indeterminate rift or opening (khaínein, to open). However, the cosmogonic narrative does not stop at this point. Immediately after the khaos, Gaia (the Earth), Eros and Tartarus appear - entities that indicate the genesis of form and principle. The narrative movement is clear: origin is not a regime; It is a starting point to be overcome. Hesiod does not celebrate the abyss; initiate it and after it emerges. Subsequent tradition will consolidate this orientation, transforming khaos into an interval that must be closed.
With Plato, the exclusion of instability becomes philosophical and systematic. In Timaeus' cosmogony, the demiurge - figure of a divine craftsman - contemplates eternal forms and models formless matter (khora) in his likeness. Order does not emerge from chaos by emergence; it is imposed by a rational agent who applies an ideal structure to a passive substrate. Platonic physis is, therefore, deeply hierarchical: the idea precedes matter; the intelligible precedes the sensible; the one precedes the multiple. Instability, in this context, is not a regime; it is an inert raw material, awaiting its domestication through form.
Aristotle, in turn, consolidates this exclusion. In his Physics, he establishes that all change is oriented towards an end, towards the realization of the form immanent in each being. Physis is conceived as the intrinsic movement towards telos. Instability, therefore, can only be a temporary deviation, an imperfect state on the path to full realization. Even chance (to automaton) is interpreted as that which occurs outside the natural purpose, but which, nevertheless, does not escape the general framework of rational movement. The Aristotelian universe is explained by four causes, and none of them contemplates a regime that emerges without purpose, without subject, without essence. Instability is thus subsumed by teleology.
In just a few centuries, Greek thought erected the pillars of a logic that would last for millennia, dictating that: origin cannot be unstable; the real cannot be born from the formless; that which lacks a center must be overcome.
Even Heraclitus, often evoked as the thinker of change and flux, subordinates conflict to a universal logos. "Pólemos is the father of all things", he states. However, the polemos does not constitute an unstable and disoriented regime; it is, rather, a generative principle whose tension is justified by a superior harmony. The universal flow is subject to a cosmic reason, a reason that does not tolerate excess without containment. Instability, in its essence, was never really thought about; was neutralized, absorbed, justified or simply rejected. It was not granted the right to exist for its own sake, but only as a transitory interval before the establishment of the cosmos. Greek philosophy, in short, did not listen to chaos; diverted it, transforming it into a rationalized form of order.
In the transition to modernity, instability metamorphoses from a metaphysical void to a functionally necessary deviation, albeit always under strict surveillance. Already in Lucretius, in De Rerum Natura, the clinamen - this minimal and unpredictable deviation of atoms that allows their collision and the consequent formation of the world - is introduced not as a manifestation of autonomous instability, but as an explanatory resource. Its function is clearly finalist: freeing nature from absolute determinism and enabling the emergence of the world and freedom. Deviation is tolerated because it prepares the form, because it makes organisation possible. It is never recognized as an independent ontological regime.
Mechanistic modernity, with Descartes at its head, reinforces this gesture of containment. The physical world is entirely reducible to extension and movement, and therefore to mathematical predictability. Chaos, in this paradigm, is unthinkable; everything follows from clear, rational and geometric laws. Isaac Newton consolidates this architecture: the universe is a machine perfectly regulated by universal forces, where any apparent instability is merely an effect of our local ignorance. The real is predictable; the deviation is a calculation error, not an intrinsic power of the real. Instability is, in this model, expelled from the cosmos as a principle.
Gottfried Wilhelm Leibniz conceives the world as the best of possible worlds: an infinitely rational structure where even chance finds its place, but always governed by a pre-established harmony. Nothing emerges from the unpredictable. The possible is a variant of order, and order is the sine qua non of all reality.
Immanuel Kant's critical turn, although apparently opening space for the incalculable - especially in the experience of the sublime, the unlimited - , does not affirm instability. On the contrary, he tames it through practical reason. Chaos, whether as a natural threat or as a limit of understanding, serves to confirm the need for the subject's a priori structure. Instability, in Kant, authorizes the transcendental, but fails to think about the "outside", which transcends reason itself.
With Georg Wilhelm Friedrich Hegel, this rationalization reaches its apogee. Negativity is finally integrated, but only as a dialectical moment of the spirit's self-overcoming. Becoming, contradiction, collapse: everything is permitted, but everything is ultimately reconciled. Instability is necessary, but only for reason to realize itself as absolute. Negative is never a persistent condition; it is a stage of overcoming. Chaos, if admitted, is only the "other" of order, and never its inner regime.
Thus, between Lucretius and Hegel, Western philosophy orchestrates a sophisticated strategy: it does not reject instability outright, but incorporates it as a functional resource, subordinate to freedom, order, reason or totality. That which is unstable is only acceptable if it is in transit to some form - be it physical, moral or dialectical.
In the philosophies of the 20th century that rebelled against the totalizing systems of modernity - notably in French post-structuralism - instability stops being rejected and starts to be celebrated. However, this celebration, in many cases, becomes a new form of capture. It is no longer a question of integrating it into a rational structure, as in Hegel, but of transforming it into an aesthetic, symbolic or desiring principle, devoid of material reinscription.
Gilles Deleuze and Félix Guattari are, perhaps, the most influential formulators of this shift. In Anti-Oedipus and A Thousand Plateaus, they propose a rhizomatic ontology of reality: there is no center, there is no origin, there is no plane. What exists are lines of flight, deterritorializations, nomadic movements, flow regimes that intersect, interrupt and bifurcate. The world is not cosmos; It's chaos. However, this chaosos, far from designating an operational regime of matter, is often presented as an intensive field of desire, a space of continuous variation, a plane of multiple consistency. Instability becomes libidinal flow, vibrating surface, non-hierarchical multiplicity - but hardly as a physical regime of material emergence.
In Jean Baudrillard, instability takes on a distinct face: that of spiral simulation. The acceleration of signs, the collapse of reference, the implosion of reality are forms of radical instability, but no longer material. The chaos here is hyperreal, an effect of symbolic excess, of informational saturation. The disorder is no longer physical; It's media. Consequently, more than thinking about the emergence, this instability annihilates the registration regime itself. It is the end of the form, not its mutation.
Jean-François Lyotard discusses the collapse of grand stories and the multiplicity of language games. Instability, in this context, is epistemological and political: there is no longer narrative unity, nor totality. However, this fragmentation, despite being critical, is rarely reinscribed as a positive ontological regime of matter. Thought dissolves into multiplicity without anchoring, without questioning from which body these voices emerge.
Even in complexity sciences, instability is beginning to be recognized as productive, but without this generating a true philosophical reinscription. Ilya Prigogine, for example, demonstrates that systems far from equilibrium can generate spontaneous order - so-called dissipative structures. Instability, in this context, does not destroy the system; rearrange it. However, philosophical discourse remains, to a large extent, oblivious to this reformulation. Science points the way, but philosophy did not listen. The leap between physical instability and symbolic inscription does not materialize.
Thus, if in the classical tradition instability was denied, in the contemporary tradition it is celebrated, but without body, without regime, without real consequence. Chaos turns into flow, collapse, performance. But there is no material reorganisation. There is no listening to instability as an operative condition. There is slippage, there is speed, there is implosion - but there is no ontological gesture that recognizes it as a foundation.
Throughout this entire journey, from archaic cosmogony to the avant-garde of the 20th century, instability was systematically stopped before it could become a principle. Whether named as khaos, clinamen, chance, negativity, flow or collapse, it has never been recognized as an autonomous ontological regime. It was support for organisation, transition to form, interval of harmony or aesthetics of dissolution - but never a regime of support for reality.
It's not just a question of name or image; it is a matter of ontological listening. Western philosophy, even in its most critical aspects, did not recognize instability as an operative body. The unstable was converted into a sign (in postmodernity) or subordinated to teleology (in the classical tradition). In no case was it recognized as a permanent condition of emergence, as a base without foundation, as a fertile field without a plan.
This "deafness to the unstable" is not neutral. By refusing instability as a structure, inherited thinking reinforced the illusion of order as an essence - and, with it, the idea that everything that exists must obey a purpose, a logic, a predicted form. The origin, therefore, has always been a mistake: it was either projected as a point, or as a substance, or as a regulating idea. But it was never recognized as an event without an author, without a center, without a guarantee.
This text stops here. It does not yet propose a new foundation, nor does it anticipate what could be a thought of affirmative instability. It is limited to carrying out the necessary gesture: clearing the field. Show that thought did not fail by accident, but by structure - because it was incapable of thinking about what cannot be submitted, what cannot be resolved, what cannot be ordered. Instability, if it wants to be thought about, will have to be heard in another way. This gesture will be the next step.