 Space, presented as object (as we are actually required to represent it in geometry), contains more than [the] mere form of intuition—viz. it contains also the gathering together [Zusammenfassung] of the manifold given according to the form of sensibility, in an intuitive representation—so that the form of intuition gives us merely a manifold, but formal intuition gives us unity of representation. In the Transcendental Aesthetic I had merely included this unity with sensibility, wanting only to point out that it precedes any concept. But this unity indeed presupposes a synthesis which does not belong to the senses, through which all concepts of space and time first become possible. For through this unity (inasmuch as understanding determines sensibility), space or time is first given as intuitions, and hence, the unity of this intuition belongs a priori to space and time, and not to the concept of understanding (§24). (B160–1, note)