The first assumption that all perfectly natural properties are intrinsic has been rejected by Weatherson (2006). (See also Yablo 1999 who holds that, even if every perfectly natural property is intrinsic, this fact is at best a lucky accident, and that this renders Lewis’s account unsuccessful as a philosophical account of intrinsicality.) Weatherson claims that it is metaphysically possible for the instantiated perfectly natural properties to be vector properties. He then argues that, since vec