Could you give a reference to this article? Penrose staircase and other impossible constructions used by Escher do not have much to do with the usual meaning of non-Euclidean in mathematics (hyperbolic, spherical geometry, etc.).
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Thanks, that's interesting! And original article here: http://links.jstor.org/sici?sici=0007-0882%28196908%2920%3A2%3C121%3APG%3E2.0.CO%3B2-M …
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Have you heard about five-sided squares? https://www.youtube.com/watch?v=n7GYYerlQWs … Also this paper by Priesthttps://www.tandfonline.com/doi/abs/10.1080/00048409912349211 …
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I hadn't heard of this, thank you!
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