Peritrope (Greek: περιτροπή) is Socrates' argument against Protagoras' view of subjective truth, as presented in Plato's book known as Theaetetus (169–171e). This formed part of the former's eighth objection, the "table-turning" argument that maintained Protagoras' doctrine was self-refuting.[1] Peritrope – as the basic objection – has also been used by Greek philosophical commentators as well as modern philosophers.[2]