 Perception, like intuition, is also sometimes described as representation of an undetermined object (e.g., B422n). However, perception also involves a consciousness of the “manifold” or “content” (Inhalt; more on this notion of “content” below) of the intuition (A99, A119–20, B160, B162, B202–3; Pr 4:300). What Kant means by this is not entirely obvious. However, Kant is clear that perception necessarily requires the activity of the imagination in combining together the content of the intuition into what Kant calls an “image” (Bild), which yields or constitutes consciousness of the content of intuition itself (A120, B160; see Sellars 1978; Young 1988; Allison 2015: 254–264; Matherne 2015; Tolley 2019, 2020). Kant also indicates that in perception the “mathematical” categories of quality and quantity are employed, though not the relational or modal categories, which are constitutive of experience only (A161-2/B201; see Allison 2015: 414–426).