Motion as Exteriority-to-Self

Motion as Exteriority-to-Self is the account of motion as a mode of being in which a moving thing is exterior to itself, rather than simply a thing at rest transported through space. It revises the assumption that motion leaves being unchanged in its being: motion preserves a thing’s quality, but changes its mode of being, producing passage, trajectory, and a fleeting spatial becoming that consciousness apprehends across time.

The problem of the moving thing

The account begins by challenging the postulate that being remains unchanged whether at rest or in motion. The Eleatic arrow seems to occupy a place at each instant just as an arrow at rest would; if motion is merely an accident superimposed on being, nothing in being distinguishes movement from rest. The difficulty is not resolved by debating the infinite divisibility of space and time. It concerns what the moving body must be if its quiddity remains unchanged while its mode of being differs from that of a stationary body.

The source of the Eleatic paradox is a pair of assumptions that cannot comfortably coexist. The arrow is said to pass through AB, which means it does not remain there; at the same time, it is presumed to retain its being-in-itself. It therefore seems both to be at AB and not to be there. The proposed correction is not to deny passage but to abandon the assumption that motion preserves being-in-itself in precisely the same way as rest. Passage is a distinct mode of being, not a succession of stationary occupations added together.

Place, passage, and exteriority

To pass a place is simultaneously to be there and not to be there. No instant can be isolated as the passage’s settled presence without arresting the motion, yet passage cannot simply be declared absent or elsewhere. Its relation to a place is not one of occupation. A stationary “this” is located through its exterior relations to a ground and to other “thises”; space itself is founded in reciprocal exteriority, disclosed by the For-itself.

The moving “this” does not merely traverse that already constituted field. Because it is no longer caught up in the same exterior relations that define its place, it is already exterior to them. The relations among places cannot be annihilated, but the moving thing’s passage cannot be contained by any one of them: while it is still at a place, it is already no longer there. Motion is thus defined by being’s exteriority to itself. This formulation shifts the question from where a moving object is at a particular instant to how its being relates to itself across passage.

Quality and the unstable being of motion

Motion does not amount to qualitative becoming. The red ball rolling across a billiard table does not cease to be red, and its movement neither changes the essence of redness nor actualizes a new quality. Rather, the red’s mode of being is altered: as the ball is already at B, its red is exterior to what it was at A, and in that sense is abolished; as it is rediscovered at C beyond B, it is exterior to that very abolition. Through abolition it escapes being, and through being it escapes abolition.

This is why motion cannot be described as either straightforward persistence or straightforward disappearance. Certain “thises” have the peculiar property of never being without thereby becoming nothingnesses. The moving body remains identifiable, but its being is caught in a vacillation that makes it neither wholly present nor wholly abolished. Exteriority-to-self is not a pure feature that could be defined within the In-itself alone. It is disclosed to a consciousness capable of apprehending a being as already, in a sense, over there while it is here.

The trajectory as evanescent unity

The trajectory gives this exteriority a worldly sign, but it does not exist as a lasting object. It is described as a “substantiated nothing”: a line that appears to unify the moving thing’s passage through space, then collapses immediately into the multiplicity of external relations among places. At rest, space is; in motion, space is engendered or becomes. The trajectory never simply is, because its apparent unity vanishes into spatial dispersion.

Motion is accordingly called the “least-being” of a being that can neither arrive, be abolished, nor wholly be. It is a contingent upsurge of indifference and exteriority at the heart of the In-itself, rather than a substance or completed state. The For-itself apprehends this vacillation across temporal ekstasis: it identifies the moving body with itself through the unity of its Past and Present. That temporal identification does not require a separate act of recognition. As the moving body is continually posited in its own exteriority, its trajectory appears as an evanescent becoming; the line is extended in time and disappears along with the motion, against the background of non-temporal space’s pure dispersion.

Motion and the apprehension of time

Motion also makes the present dimension of universal time apprehensible. Without motion, the permanent identity of what remains unchanged would provide no difference by which the present could be grasped as distinct from what was. Motion presents time as a vacillation: the trajectory is already fading in the past and is not yet in the future, while its appearing has the ambiguity of an instant that cannot simply be said either to be or not to be.

The concept therefore links the moving body, the emergence of spatial passage, and the For-itself’s temporal apprehension. Motion is not merely an object’s change of location within a finished space; it is the contingent, unstable way in which exteriority arises within being and becomes legible to consciousness over time. Its significance lies in refusing to make movement a superficial accident: passage exposes a mode of being that cannot be reduced to the stable identity of a thing at rest.