  The anomalous sixth division of the sophist (Sophist 226b–231b) reveals sophistry as a disputed concept. Whereas the first five divisions locate the sophist somewhere under acquisitive art, the sixth division locates him in a quite different place, under the art of separation, marked off expressly from productive and acquisitive art, as a third kind under technê, to deal with this case. The sixth sophist purifies souls of beliefs that interfere with learning, and he looks a lot like Socrates. The Stranger queries using the label “sophist” in this case and calls the art he has just uncovered the “noble” art of sophistry. The sixth division exploits the fact that many people mistook Socrates for a sophist (cf. Aristophanes’ depiction of Socrates in the Clouds and Socrates’ defense against the charge in Plato’s Apology). This definition fails to capture the sophist by even an accidental feature, but instead snares a distinct kind called by the same name owing to a superficial resemblance.