Our ordinary view of material thingsl has two aspects. One the one hand such things typically have ports. This desk has its legs, its top, and so forth. On the other hand such things typically have locations. This desk is located at some particular region of spacetime in the office. The composition and the location of the desk are, on this view, two quite separable aspects of it. One may therefore change its composition without changing its location, for instance by swapping in a new leg, or change its location without changing its composition, for instance by moving it to the other side of the office. This view of material things remains largely intact in metaphysical inquiries into their natures. On the one hand we have the theory of composition, mereology, which considers what it is for some bits of wood to compose a desk. On the other hand we have the theory of location,‘ which considers what it is for the desk to occupy a region of spacetime.