Picture of the month
![](http://upload.wikimedia.org/wikipedia/commons/2/26/Mug_and_Torus_morph.gif)
Credit: Kieff
It is often suggested that a topologist cannot tell the difference between a coffee cup and a doughnut. This is because these objects when thought of as topological spaces are homeomorphic. The above picture depicts a continuous deformation of a coffee cup into a doughnut such that at each stage the object is homeomorphic to the original.
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