CLEINIAS: About what? Say, Stranger, what you mean.
ATHENIAN: I will; or rather I will show you my meaning by a question, and do you please to answer me: You know, I suppose, what length is?
CLEINIAS: Certainly.
ATHENIAN: And what breadth is?
CLEINIAS: To be sure.
ATHENIAN: And you know that these are two distinct things, and that there is a third thing called depth?
CLEINIAS: Of course.
ATHENIAN: And do not all these seem to you to be commensurable with themselves?
CLEINIAS: Yes.
ATHENIAN: That is to say, length is naturally commensurable with length, and breadth with breadth, and depth in like manner with depth?