(plural Penrose steps)
After a drawing by Lionel Penrose and Roger Penrose.
"penrose-steps." YourDictionary, n.d. Web. 24 March 2019. <https://www.yourdictionary.com/penrose-steps>.
penrose-steps. (n.d.). Retrieved March 24th, 2019, from https://www.yourdictionary.com/penrose-steps
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