Constitutive Impossibility

Constitutive Impossibility names the ontological principle that the Real is not simply multiple or fragmented, but is structured by an internal impossibility—the impossibility of being One—that functions as its innermost condition of (im)possibility. The move Žižek performs here, following the Kantian-Hegelian trajectory, is to refuse the standard epistemological reading (where impossibility marks only a limit of knowledge) and to inscribe that impossibility directly into being itself. The antinomies Kant located in reason's overreach are not corrected by Hegel's move to the Absolute; rather, Hegel's advance is to recognise that what appeared as a subjective distortion is the very mode through which the Real is accessed. Impossibility is not an external wall blocking contact with the Absolute—it is the Absolute's own internal structure.

This concept is specifically operative in the domain of sexuality. Lacan's formulas of sexuation are presented as homologous to Kant's antinomies of pure reason: each sexed position is constituted by a contradictory pair of propositions that cannot be resolved into a consistent whole. Sexuality as the "impossible-real Absolute" is accessible only through the gaps and detours of the symbolic order, because it has no positive, unified content to be directly grasped. The symbolic order's failure to totalize—the gaps, the detours, the missed encounters—is not an obstacle to touching the Real of sexuality but is precisely how that Real manifests. Constitutive Impossibility thus condenses the Lacanian-Hegelian wager: the not-One is not a deficiency but the positive, innermost mark of what is.

Constitutive Impossibility appears in slavoj-zizek-sex-and-the-failed-absolute-bloomsbury-academic-2019 at a pivotal moment in Žižek's argument about the Kant-to-Hegel transition. It lives at the intersection of several cross-referenced canonical concepts. Most directly, it reformulates the concept of the Barred: just as the barred Subject ($), the barred Other (S(Ø)), and barred Woman (La) are all produced by a structural bar that is not a mere negation but a positive, generative mark, Constitutive Impossibility extends this logic to ontology as such—the Real itself is "barred," marked by an internal not-One that is its condition of (im)possibility. It is also a specification of Contradiction: where Contradiction names the motor of dialectical movement within entities and concepts, Constitutive Impossibility specifies the form that contradiction takes at the level of the Real's very constitution—not a tension to be sublated but an irresolvable structural feature inscribed within being.

In relation to Absolute Knowing, Constitutive Impossibility performs a decisive function: it blocks any triumphalist reading of Hegel's Absolute by insisting that the Absolute is not a state of achieved totality but the full recognition of an irreducible gap within self-identity. The "subjective distortion" that seemed to prevent access to the Absolute turns out to be the mode of that access—a move that aligns with McGowan's reading of Absolute Knowing as the acknowledgment of an "absolute gap within self-identity." The concept also resonates with the treatment of Dialectics: Žižek's version of the Hegelian advance is not a progressive sublation of antinomies but the recognition that those antinomies are irreducible features of the Real—closer to the "implacable dialectic" that forecloses resolution than to the standard Hegelian synthesis. Constitutive Impossibility is therefore best understood as an ontological extension and sharpening of these canonical concepts, condensing their shared logic into a single, pointed claim about the structure of the Real.

Sex and the Failed AbsoluteSlavoj Žižek · 2019 (p.120)

Reality is not-One, which doesn't simply mean that it is multiple: not-One, the impossibility of being One, is inscribed into it as its own innermost condition of (im)possibility.

The phrase "condition of (im)possibility"—with the parenthetical negation—is theoretically explosive: it refuses the standard logical alternative between "possible" and "impossible" and insists that the same impossibility is simultaneously constitutive and enabling, making the not-One not a lack to be remedied but the positive inner structure of the Real. The careful distinction between "multiple" and "not-One" further signals that this is not a pluralist ontology but a properly dialectical-Lacanian claim: the bar on the One produces a structural remainder irreducible to any count or series.