But what if this were all some trick and if, in this strange land, Olivia had simply been flashed before his eyes by the aid of mirrors?
"I find," said the prince with deliberation, "that in America you are familiar with the argument that, if your people understood only length and breadth and did _not_ understand the Third Dimension--thickness--you could not then conceive of lifting, say, a square or a triangle and laying it down upon another square or triangle.

In other words, you would not know anything of _up_ and _down_." St.George nodded.

This was the familiar talk of college class-rooms.
"As it is," pursued the prince, "your people do perfectly understand lifting a square and placing it upon a square, or a triangle upon a triangle.

But you do not know anything about placing a cube upon a cube, or a pyramid upon a pyramid _so that both occupy the same space at the same time_.

We of Yaque have mastered that principle also," the prince tranquilly concluded, "and all that of which this is the alphabet.