Note 442 — THE TRANSCENDENTAL AESTHETIC SECTION I SPACE METAPHYSICAL EXPOSITION OF THE CONCEPTION OF SPACE[422]
Reading edition
“That in space there are no more than three dimensions, that between two points there can be but one straight line, that in a plane surface from a given point with a given straight line a circle is describable, cannot be inferred from any universal notion of space, but can only be discerned in space as in the concrete.” Cf. also Prolegomena, § 12.