 There are other texts, which have been used to argue directly for the view that Aristotle embraces matter-involving forms: De Anima i 1, where Aristotle describes anger as desire for retaliation manifested in boiling of the blood around the heart; or Physics ii 2, where he says that natural forms are analogous to snubness, i.e., concavity realized in a nose. Defenders of pure forms can attempt to deal with these passages by distinguishing between a pure form, and a broader “definition” (logos, horos, horismos) which brings in other causes.