Wikipedia:Today's featured picture (animation)/July 18, 2007
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This animation shows a classic example of homeomorphism: a coffee mug and a torus are topologically the same. Roughly speaking, a topological space is a geometric object and the homeomorphism is a continuous stretching and bending of the object into a new shape. The traditional joke is that topologists can't tell the coffee cup from which they are drinking from the donut they are eating, since a sufficiently pliable donut could be reshaped to the form of a coffee cup by creating a dimple and progressively enlarging it, while shrinking the hole into a handle.
Image credit: Kieff Recently featured: Earth's atmosphere - Arachnida - Holdridge life zones |