(plural Penrose stairs)
After a drawing by Lionel Penrose and Roger Penrose.
"penrose-stairs." YourDictionary, n.d. Web. 10 November 2018. <https://www.yourdictionary.com/penrose-stairs>.
penrose-stairs. (n.d.). Retrieved November 10th, 2018, from https://www.yourdictionary.com/penrose-stairs
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