 Suppose there is a cube of completely homogenous and gunky jello on the table, with no empty space inside. Suppose that the cube can’t survive being sliced or having its parts scattered. Suppose that the jello composing the cube is a fundamental stuff-kind. On the set-theoretic proposal, to say that the jello constitutes the cube is to say that a set of jello-individuals constitutes the cube. Which individuals? One non-option is the set {cube}, for then the jello would be identical with the cube, and could not undergo any changes which the cube could not. So, the set must include at least two jello individuals. Suppose that the set’s members are the left and right halves of the jello—call them ‘Lefty’ and ‘Righty’. So, saying that the jello constitutes the cube is to say that {Lefty, Righty} constitute the cube. But, of course, there is also the set of Lefty’s left half, right half, and Righty’s left and right halves. This set, {Lefty’s left half, Lefty’s right half, Righty’s left half, Righty’s right half}, is a better candidate to identify with the jello stuff, since it will survive if cut into four pieces the right way, whereas {Lefty, Righty} will not. We want to pick out the set of jello-individuals which can survive any kind of scattering. But, the problem, of course, is that Lefty’s left half is composed of Lefty’s left half’s left half, and so on. Since the postulation of gunk rules out employing a set of point-particles, there appears to be no set of jello-individuals that we can identify the jello stuff with which can serve to pick out all the jello stuff and account for the persistence conditions of the stuff (=set) in the right way. So, there is absolutely nothing which is the set of individuals which make up the cube. If we wish to identify the jello stuff with every set that is some of it, since the members of every set are themselves composed of further sets, then it is sets ‘all the way down’, where we never arrive at members which are not composed of further members of sets of stuff. Dean Zimmerman notes,