 Third, on a plausible story about what non­-fundamental entities there are, it will turn out that on Almost-Lewis’s view, everything that exists is composed of simples (parts, that themselves have no proper parts). Lewis is also agnostic on this score: he takes it to be at least an epistemic possibility that there is “gunk”: something, every proper part of which itself has a proper part (see for example Lewis 1991). Lewis says relatively little either about the status of this possibility (in particular, is it more than merely epistemic?), or about its potential ramifications for his various positions in metaphysics. To keep things simple, I will discount it for the remainder of this main essay.