(plural Penrose staircases)
After a drawing by Lionel Penrose and Roger Penrose.
"penrose-staircase." YourDictionary, n.d. Web. 09 November 2018. <https://www.yourdictionary.com/penrose-staircase>.
penrose-staircase. (n.d.). Retrieved November 09th, 2018, from https://www.yourdictionary.com/penrose-staircase
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