  At this point, one might wonder if Protagoras can turn the tables on Aristotle. Certainly, to a Protagorean, showing that PNC is indubitable would show that it is true, but it also assumes his own view, that how things appear is how they are! Does Aristotle or Protagoras win? The same can be asked of the “exquisite” argument of Plato’s Theaetetus. Is Protagoras’s view refuted or confirmed? The Stoic Chrysippus apparently wrote a whole book, now lost, on such table-turning arguments.