I want to consider a much-disputed reading of a certain critical area of Plato's Sophist. It is widely agreed by most commentators that in this text, between 255E and 259E there occurs a refutation of Parmenides' dictum that “one cannot say that which is not”, and that this is followed by an application of the foregoing discussion to the problems of sentiential falsity. (For a partial list of commentators, see bibliography.) It is also generally agreed that Plato uses the Form, The Different, for this purpose. What is not generally agreed upon is how Plato uses The Different.