"It would not be impossible to prove with sufficient repetition and a psychological understanding of the people concerned that a square is in fact a circle. They are mere words, and words can be molded until they clothe ideas and disguise."

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She stepped out from among their shifting confusion of lovely lights and shadows. A circle of grass, smooth as a lawn, met her eyes, with dark trees dancing all around it. And then --Oh Joy! For he was there: the huge Lion, shining white in the moonlight, with his huge black shadow underneath him.

— C. S. Lewis