 Like Leibniz, Kant can be seen as a Russellian monist. Kant endorses a version of structuralism about physics: “All that we cognize in matter are nothing but relations. What we call the intrinsic determinations of it are intrinsic only in a relative sense…” (1781/1787: A285/B341; Pereboom 1985: 413–23, 1991a,b, 2011: 100–101; Van Cleve 1988; Langton 1998; cf. Holden 2004: 236–63). In material objects we discover only extrinsic properties and relatively intrinsic properties, never any properties that are absolutely intrinsic. Indeed, for Kant, matter itself does not have absolutely intrinsic properties. That is because he regards matter as “mere appearance”. Thus, he writes, “what it [matter] itself consists in is the mere relation of something in general to the senses” (1781/1787: A285/B341). If matter were instead a “thing-in-itself”, he implies, then it would need to have absolutely intrinsic properties. Nevertheless, in his view all features of appearance, including both matter and macrophenomenal consciousness, are grounded in things-in-themselves (or a thing-in-itself) and thus in absolutely intrinsic properties—a position that suggests both realism about quiddities and quidditism about consciousness.