 Matter is, at least potentially, infinitely divisible, but at the level of elements and mixed bodies we can refer to the smallest body capable of still being a body of that kind—the minimum naturale—e.g., “the minimal possible magnitude of fire” (EpiPhys 7.212 {114}, Glasner 2009 ch. 8; Cerami 2015, 429–36). Any sort of mixed body requires a substantial form to actualize it, but Ibn Rushd’s view of how such forms emerge evolves. His early works hold that, at least at the level of living things, substantial forms cannot be generated by wholly natural processes, but require a celestial “giver of forms,” the Agent Intellect (EpiMeta 4.171 {162}). His later view is more thoroughly naturalistic, and argues that prime matter contains the potentiality for all substantial forms, which need only be actualized by a natural agent, along with the usual cooperation of the celestial bodies (LongMeta VII.31 {883}, XII.18.109 {1499}; see Davidson 1992 ch. 6; Freudenthal 2002; Cerami 2015 chs. 8–9).