 Plato appears to hold that all properties exemplify themselves, when he claims that forms participate in themselves. This claim is crucially involved in his so-called third man argument, which led him to worry that his theory of forms is incoherent (Parmenides, 132 ff.). As we see matters now, it is not clear why we should hold that all properties exemplify themselves (Armstrong 1978a: 71); for instance, people are honest, but honesty itself is not honest (see, however, the entry on  Plato’s Parmenides,  and Marmodoro forthcoming).