How big is a thing? On the particular subjectivity of space.

From two not very controversial premises I argue for a variant of transcendental idealism: (1) Space is a non-conceptual system of particular distances and directions. (2) As a possible object of propositional truth, distance or size is relational. But (2) means the collapse of (1): In relationally equivalent worlds, one cannot distinguish between particular and conceptual size. What is needed for particular distance being an objective property of things is a global measure of such worlds. This is supplied by rational, indexical agency.

Keywords: Room, basic particulars, size, indeksikalitet, transcendental idealism