In our everyday lives, when we look at the material world, we find it to be a place consisting of ordinary objects that all share structural qualities such as persistence through time and space, the ability to survive the loss of some of their parts, and the impossibility of being collocated with one another. This description is partly inconsistent, or clashes, with certain domains of science, most notably physics (Chap. 2 ). Fundamental physics describes the world as largely empty, made up of a relatively small number of particle types that propagate through space according to equations of motion. While philosophers of physics may disagree on whether these fundamental objects are individuals, there is no doubt that we ordinarily perceive the world as consisting of individuals that possess essential structural qualities.