 As Rosefeldt notes, the conclusion of the second step, the applicability of the categories to space and time, requires appeal to a composing synthesis, since the decomposing synthesis precedes all concepts, and only in the composing synthesis are the categories invoked. Thus a transition from the decomposing to a composing synthesis must be made. One possible strategy is to claim that a composing synthesis is not required for our representation of space as whole, but only for our representations of determinate parts of space, as when we construct figures in geometry. But while the text of the B160–1 note does reference geometry, it also suggests (in the final sentence) that a composing synthesis is required for our representation of space as a whole. Onof and Schulting (2015) argue that it is our explicit representation of the unicity of space as a whole that requires synthesis in accord with the categories, and they embellish their account by specifying precisely which categories are required for the various aspects of unicity (Allison 2015: 420–30 provides a complementary account). An alternative, suggested by Rosefeldt (2022), is that first of all, the finite spatial parts that we actually distinguish in decomposing synthesis, either of individual spatial parts or of various such parts taken as a group, feature a unity, representation of which must be accounted for by compositional synthesis. But further, we are conscious of the fact that the infinite space revealed as the phenomenal horizon in the decomposing synthesis can be subdivided infinitely into finite spatial parts, all of which are represented as parts of that one all-encompassing infinite space. Our representation of the unity of all of this, which Rosefeldt calls world-unity, must also be accounted for by a composing synthesis. From this we can see that given that a composing synthesis accounts for the represented unity of the actual finite spaces we distinguish, it can account for the represented world-unity as well. (For a discussion on how a composing synthesis can operate on a target that is indeterminate in the way that world-unity is, see Daniel Sutherland 2021, ch. 5, referenced in Rosefeldt 2022: 16 n.5).