Is everyone with one face called a Milo?"
"Oh no," Milo replied; "some are called Henry or George or Robert or John or lots of other things."
"How terribly confusing," he cried. "Everything here is called exactly what it is. The triangles are called triangles, the circles are called circles, and even the same numbers have the same name. Why, can you imagine what would happen if we named all the twos Henry or George or Robert or John or lots of other things? You'd have to say Robert plus John equals four, and if the four's name were Albert, things would be hopeless."
"I never thought of it that way," Milo admitted.
"Then I suggest you begin at once," admonished the Dodecahedron from his admonishing face, "for here in Digitopolis everything is quite precise.

Author: Norton Juster