http://demonstrations.wolfram.com/AVisitToSphereland
The Wolfram Demonstrations Project contains thousands of free interactive visualizations, with new entries added daily.
In [1] (example 1.4.2, p. 32), William Thurston describes an imaginary journey that takes place in the equally imaginary Sphereland. Instead of "Once upon a time?", Thurston begins, "Imagine creature A resting at the north pole and another creature B cr...
Contributed by: John Kiehl
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