 David Lewis famously propounded the doctrine of Unrestricted Composition: that is, any combination of things in the world constitutes a further thing (e.g., 1986, 211). So my left foot and any arbitrary stone at the bottom of the sea constitutes an object, though an object of no descriptive or explanatory interest. In the opposite corner, Peter van Inwagen (1990) denied that there was any such thing as composition, at least for inanimate material objects.