 Plato rejected these materialist attempts to explain everything on the basis of that of which it was made. According to Plato, the governing principles were the intelligible Forms, which material objects attempted to copy. These Forms are not substances in the sense of being either the stuff or the individuals or the kinds of individuals out of which all else is constructed. Rather they are the driving principles that give structure and purpose to everything else. In itself, the rest would be, at most, an unintelligible chaos. The Forms meet criterion (i)—ontological basicness—but in a slightly eccentric way, because they do not, in a normal sense, constitute things. They meet (ii)—durability—in a strong fashion, for they are eternal. They are not, in the intended senses, the subjects of predication, and in no sense the subjects of change, so they do badly on (iii) and (iv). They do not do well on (v) for they are not individual things in any normal sense, though they are individuals, of a very unusual kind. (Aristotle’s main criticism of Plato’s Forms was that they are a bastard confusion of universal and particular; see Fine 1993.) They are in no way kinds of stuff, hence failing (vi). But failure to meet these standards is not carelessness on Plato’s part. It reflects his emphasis on criterion (i), together with his particular view about the way in which forms are basic.