Ontological Incompleteness of Reality

Ontological Incompleteness of Reality is the thesis, advanced by Žižek in his reading of Lacan and Hegel, that the gap, inconsistency, or non-totality we encounter in our access to the world is not a limitation of the knowing subject but a feature of reality itself. Where a standard Kantian (or epistemological) position would say that we simply cannot know the whole of reality, Žižek insists on the stronger, properly ontological claim: reality is not a complete, self-consistent whole to begin with. The "non-All" (pas-tout) — Lacan's logical operator for the feminine side of sexuation — is re-deployed here as a general ontological category: the world does not form a closed totality because it is constitutively fractured by an internal gap or contradiction. This move is described as isomorphic with the shift from Kant to Hegel (from epistemic humility about the thing-in-itself to the dialectical claim that contradiction is immanent to the Absolute itself), and from classical to quantum physics (from Einstein's deterministic completeness to Bohr's irreducible indeterminacy at the level of the real).

The concept thus formalizes a re-ontologization: what had previously been treated as a problem of representation or knowledge — our inability to totalize reality — is redescribed as a positive, constitutive feature of reality's own structure. Sexual difference, in this framework, is not merely a social or symbolic construction layered onto a complete biological reality; it is the privileged site where reality's own incompleteness becomes legible. The formal a priori condition for the subject's constitution — the lack of a founding binary signifier, the non-relation between the sexes — is simultaneously the trace of reality's own non-All structure. Sexuation is thus elevated from an anthropological or clinical category to a genuinely ontological one.

Ontological Incompleteness of Reality appears exclusively in slavoj-zizek-less-than-nothing-hegel-and-the-shadow-of-dialectical-materialism-v, where it functions as the speculative fulcrum of Žižek's argument about sexual difference and ontology. It is best understood as an extension and radicalization of the canonical concept of the Not-all: where the not-all names the logical structure of the feminine side of sexuation (a non-totalizable series without a constitutive exception), ontological incompleteness universalizes that structure into a claim about reality as such. The not-all is no longer merely one of four quantificational operators in the formulas of sexuation; it becomes the fundamental ontological condition of any reality whatsoever. Similarly, the concept extends the canonical understanding of the Real — specifically the second-order Real (R2) produced by the Symbolic's own impossibilities — by insisting that the crack or gap is not just immanent to representation but to being itself. The Real's resistance to symbolization is not a contingent failure of language but reflects a genuine incompleteness on the side of what is.

The concept also anchors the ontological re-reading of Sexuation and Castration: if reality is non-All, then sexuation (the formal distribution of speaking beings relative to the phallic function and its constitutive lack) is not imposed on a complete reality from outside but is itself an expression of reality's inner structure. Castration — understood as the structural loss that sets desire in motion — becomes, at this level, not merely an anthropological fate but the subjective registration of an ontological fact. The concept thus situates itself at the intersection of Lacanian formalization and Hegelian dialectics, reading both as converging on the same claim: incompleteness, gap, and contradiction are not defects to be overcome but the very condition of any actual existence.

Less Than Nothing: Hegel and the Shadow of Dialectical MaterialismSlavoj Žižek · 2012 (page unknown)

The truly difficult thing is to accept the second choice, the ontological incompleteness of reality itself.

The phrase "second choice" marks the decisive theoretical wager: it contrasts the harder ontological option against the easier epistemological one (the "first choice" of mere cognitive limitation), and the word "accept" signals that this is not a logical deduction but a genuinely difficult philosophical commitment — a shift in framework rather than a conclusion within one.