Facticity as Body-for-the-Other
ELI5
When someone looks at you, they "freeze" your body into a thing with fixed qualities you can't control — like your height, your face, your race — and that frozen version of you is what Sartre calls the body-for-the-Other. You can never fully see or recover it yourself, because it only exists from the Other's point of view.
Definition
Facticity as Body-for-the-Other names a third ontological dimension of the body in Sartre's phenomenological ontology — a dimension irreducible to either the lived body as pure, non-thetic self-presence (the body-for-itself) or the physiological body known by medical science. This third dimension arises precisely when the Other's look falls upon me: my facticity — the brute, unchosen givenness of my body that my own transcendence perpetually flees and surpasses — is seized by the Other and fixed as an irremediable object-state. Crucially, I cannot directly experience my body-for-the-Other from within my own perspective; I can only "apprehend it emptily," as a form of alienated self-knowledge that arrives from outside. My transcendence, which constantly nihilates and flees its own facticity, is itself transcended by the Other's look, which arrests that flight and returns my facticity to me as an alien, objective fact about me that I cannot repossess.
Language enters this structure as a secondary mediator: once the Other has constituted my body-for-the-Other through the look, language imports and installs the Other's conceptual categories onto what Sartre calls the reflective or quasi-psychic body — the body as I attempt to recover and represent it to myself in reflective consciousness. This mediation is never transparent; the concepts language brings are the Other's tools, fitted to an exterior perspective that can never coincide with my lived interiority. The result is a permanent structural disjunction: the facticity I live pre-reflectively, the facticity alienated by the Other's gaze into an object, and the facticity I retrieve through language-laden reflection are three irreducibly non-coincident registers of one body.
Place in the corpus
This concept appears in jean-paul-sartre-hazel-barnes-being-and-nothingness-an-essay-on-phenomenological as part of Sartre's tripartite ontology of the body, and it functions as the point where his analysis of the for-itself intersects most sharply with the problem of intersubjectivity. It is an extension and complication of the Sartrean account of consciousness: if consciousness (the for-itself) is defined as translucent nihilation that perpetually flees its own facticity, then the body-for-the-Other names exactly what escapes that flight — the residue that the Other's look crystallizes into an opaque object-state that consciousness cannot dissolve. The cross-referenced concept of the Gaze is the Lacanian re-articulation of a structurally cognate operation: just as the Sartrean Other's look seizes and objectifies my facticity from an unlocatable outside, the Lacanian gaze is a "stain" in the visual field that pre-exists and envelops the subject's own vision. However, where Sartre frames this as an existential contest between two freedoms — my transcendence and the Other's transcendence — Lacan systematically removes the subject from that contest by locating the gaze in the Real as objet petit a, making it constitutively unapprehensible rather than merely difficult to recover.
The cross-reference to Alienation is equally structural: the body-for-the-Other is an alienation of facticity in the precise sense that my own givenness is estranged from me and returned as the Other's knowledge about me. This parallels the Lacanian vel of alienation — the forced choice between being and meaning — insofar as what I live pre-reflectively (being) and what the Other's look and language constitute (meaning) are asymmetric and non-recoverable. The Imaginary register also subtends this concept: the body-for-the-Other is a specular objectification, a fixing of the self in an image held by the Other, which resonates with how Lacan locates bodily consistency in the Imaginary as the register of ego-alienation and méconnaissance. Language's role in importing the Other's conceptual knowledge further engages the cross-referenced concepts of Knowledge and Reflection, situating this concept at the junction where the lived body, the alienating look, and the signifying order converge.
Key formulations
Being and Nothingness: An Essay on Phenomenological Ontology (page unknown)
in and through the transcendence which the Other surpasses, the facticity which my transcendence nihilates and transcends exists for the Other
The quote is theoretically dense because it holds three operations in simultaneous tension: my transcendence's perpetual nihilation of my own facticity, the Other's transcendence that surpasses and thereby arrests my transcendence, and the resulting ontological remainder — "the facticity which my transcendence nihilates and transcends exists for the Other" — a facticity that only comes to exist as a stable object precisely through the Other's look overriding my flight from it. The phrase "exists for the Other" is the pivot: it marks that this dimension of the body has no mode of existence interior to my own consciousness, making alienation not a distortion of an original self-possession but the very condition under which bodily facticity becomes determinate at all.