"Twas a jolly old pedagogue, long ago, Tall and slender, and sallow and dry; His form was bent, and his gait was slow, His long thin hair was white as snow, But a wonderful twinkle shone in his eye. And he sang every night as he went to bed, "Let us be happy down here below: The living should live, though the dead be dead." Said the jolly old pedagogue long ago."

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What is the shape of space? Is it flat, or is it bent? Is it nicely laid out, or is it warped and shrunken? Is it finite, or is it infinite? Which of the following does space resemble more: (a) a sheet of paper, (b) an endless desert, (c) a soap bubble, (d) a doughnut, (e) an Escher drawing, (f) an ice cream cone, (g) the branches of a tree, or (h) a human body?

— Rudy Rucker