 although it is sometimes assumed that [the two-aspect reading] commits Kant to a highly implausible one-to-one mapping of the phenomenal and noumenal, I take that to be a red herring. First, it is one thing to distinguish between things (taken collectively) as they are for us in virtue of the sensible conditions of human cognition and as they might be for some putative pure understanding, unburdened by such conditions, and quite another to affirm a one-to-one correspondence or isomorphism between the members of the two domains. (Allison 2004: 459 note 19; cf. Allison 1987: 168)