[239e]
Stranger
It is evident, Theaetetus, that you never saw a sophist.
Theaetetus
Why?
Stranger
He will make you think his eyes are shut or he has none at all.
Theaetetus
How so?
Stranger
When you give this answer, if you speak of something in mirrors or works of art, he will laugh at your words, when you talk to him as if he could see.