Sliding

In Sartre's existential ontology, "Sliding" designates a specific mode of appropriation in which the subject relates to the world not by taking root — not by sinking into the in-itself and becoming fixed, inert, substantial — but by maintaining a dynamic, gliding contact with a surface that leaves no lasting trace. To slide is to traverse being without being absorbed by it: the sliding subject touches the in-itself continuously yet remains free, leaving the world intact even as it passes across it. This makes sliding a figure for the for-itself's constitutive relation to being — engaged yet unrooted, in contact yet never identified with what it touches. The movement of sliding is thus not incidental but ontologically charged: it dramatizes the structure of freedom as lack, a consciousness that desires the density of being (the in-itself) without surrendering its own nihilating transparency.

Within the broader argument of existential psychoanalysis, sliding belongs to a taxonomy of appropriative activities — alongside skiing, swimming, art-making, and scientific inquiry — all of which are fundamentally unified by the desire of being, the impossible project of becoming the in-itself-for-itself. The gliding motion enacts this project: the subject "possesses" the world symbolically, mastering its surface without being swallowed by it, momentarily synthesizing freedom and facticity. Sliding therefore functions as a concrete existential symbol: its phenomenal shape — frictionless, surface-grazing, impermanent — mirrors the ontological condition of the for-itself itself, which can never coincide with being but is always running across it.

The concept of Sliding appears in jean-paul-sartre-hazel-barnes-being-and-nothingness (p. 584), situated within the book's culminating account of existential psychoanalysis and its ontological foundation. There, Sartre argues that the fundamental project of human reality is desire — specifically, desire of being — and that all concrete human activities (sport, art, play, science) are modes of appropriation aimed at an impossible synthesis: the in-itself-for-itself. Sliding is one such mode, read phenomenologically as a revealing gesture of freedom. It cross-references the corpus's central Sartrean concepts directly: it presupposes Consciousness (the for-itself as nihilating transparency), instantiates Desire (as the lack that reaches toward but never absorbs the in-itself), and illustrates the structure of Appropriation (possessing without merging). Its negative definition — "the opposite of taking root" — also implicitly invokes the In-itself-for-itself as the horizon that sliding asymptotically approaches but never reaches.

Relative to the canonical Lacanian concepts provided, Sliding occupies an instructive contrast position. Where Lacanian Desire is constituted through the signifier, circling around an absent objet a and structured by the Other's desire, Sartrean sliding stages desire as an embodied, motile, first-person project directed toward being-as-such. Both frameworks nonetheless share a structural insistence on the unfulfillability of desire: just as the Lacanian subject can never close the gap between need and demand, the sliding subject never takes root — never achieves the in-itself solidity it enacts contact with. Similarly, the Consciousness cross-reference reveals the deep tension between the Sartrean source (consciousness as sovereign, translucent, free) and the Lacanian decentring of consciousness as secondary and deceived. Sliding is thus a concept that is native to the Sartrean ontological register and cannot be imported into Lacanian theory without transformation, yet it resonates structurally with Lacanian desire's restless, non-appropriating movement around its lost object.

Being and Nothingness: An Essay on Phenomenological OntologyJean-Paul Sartre · 1943 (p.584)

To slide is the opposite of taking root.

The aphoristic opposition between "slide" and "taking root" is theoretically loaded because "taking root" names the very condition the for-itself structurally cannot achieve — inert, grounded, in-itself being — while "sliding" names the for-itself's only available mode of engagement with that being: dynamic, surfacic, non-absorptive. The two terms thus compress the entire ontological drama of the for-itself's desire of being into a single kinetic contrast.