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'Spacing is at once splintering and productive. As Derrida puts it, "spacing is a concept which also, but not exclusively, carries the meaning of a productive, positive, generative force... it carries along with it a genetic motif: it is not only the interval, the space constituted between two things (which is the usual sense of spacing), but also spacing, the operation, or in any event, the movement of setting aside." 

Spacing, as distinct from space, is first and foremost not a thing but a movement. If it is anything, it is no-thing: "Spacing designates nothing, nothing that is, no presence at a distance; it is the index of an irreducible exterior, and at the same time of a movement, a displacement that indicates an irreducible alterity. I do not see how one could dissociate the two concepts of spacing and alterity."'

Wigley, The Architecture of Deconstruction.