"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?"

Source : Rudy von Bitter Rucker, Rudy Rucker (1985). “The Fourth Dimension: A Guided Tour of the Higher Universes”, p.91, Houghton Mifflin Harcourt

Rudy Rucker

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