 This is not to say that there is no discussion of space’s status relative to the mind in the correspondence. Leibniz asserts in his last letter that relations are “ideal” because they are neither substances nor accidents, and are therefore not elements of reality (L5: 47). As he writes in the New Essays, in reality there are only substances and properties of substances; the mind “adds” relations (New Essays, 2.12; cf. also 2.30.4 and 2.25.1). Since space is the order of the possible relations of objects, it is presumably ideal in the sense of being mind-dependent. But Leibniz’s point here seems to be that just as people reify relations, thinking they exist independently of objects, they reify space, thinking it too exists independently of objects. So even when Leibniz discusses the ideality of space, he does so to indicate that we need not think of relations and of space as absolute in order to account for the tendency toward reification.