 One such kind of case is when the very same principles of a theory that generate the regress also lead to a contradiction. If this is so then it does not matter what we think about infinite regress in general, we will of course have reason to reject the theory, because it is contradictory. Two such examples are discussed by Daniel Nolan (2001), and we will recount one of them here (also cf. Clark 1988). The theory in question is Plato’s theory of Forms, and the regress objection is Parmenides’s Third Man objection, as reconstructed by Vlastos (1954).