In celebraion of Escher's birthday, here are some facts about Escher:
1. Escher learned about hyperbolic geometry directly from H. M. S. Coxeter at the 1952 international congress of mathematicians in Amsterdam.
2. Escher once told Mick Jagger he couldn't use his artwork for an album, and also that to him [Jagger] it was "Mr Escher", not "Mauritz"
3. Escher was actually inside out.
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