 The state of affairs in which [a simple] object x occupies a particular region of space R (at t) is distinct from the state of affairs in which [some other simple] object y occupies the same region (at the same time). From the fact that the first state of affairs obtains, we can infer nothing about the location of y. Both states of affairs obtain contingently. If any recombination of distinct, contingent states of affairs yields a genuine possibility, as I am inclined to hold, then there are possible worlds at which both x and y occupy R (at t). (2007a: 241)