SOCRATES: But how much?
BOY: Four times as much.
SOCRATES: Therefore the double line, boy, has given a space, not twice, but four times as much.
BOY: True.
SOCRATES: Four times four are sixteen—are they not?
BOY: Yes.
SOCRATES: What line would give you a space of eight feet, as this gives one of sixteen feet;—do you see?
BOY: Yes.
SOCRATES: And the space of four feet is made from this half line?
BOY: Yes.