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A doughnut, also called a torus, is a shape that you can move across in two directions, just like the surface of the Earth.  YassineMrabet via Wikimedia Commons, CC BY-NC-SA

A doughnut, also called a torus, is a shape that you can move across in two directions, just like the surface of the Earth.  YassineMrabet via Wikimedia Commons, CC BY-NC-SA