 The final answer to the completeness question we will consider focuses on the idea of a fundamental property, which is a notion discussed extensively in David Lewis’s metaphysics, and the literature that follows on from it. On Lewis’s view, a fundamental or perfectly natural property is a special kind of property, one that is, as he says, “not at all disjunctive, or determinable, or negative. They render their instances perfectly similar in some respect. They are intrinsic; and all other intrinsic properties supervene on them” (2009, 204). This suggests the following formulation of physicalism: