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by AdamStanislav - uploaded on June 9, 2016, 12:36 am
Leonardo da Vinci’s drawing of a rhombicuboctahedron, as published in Pacioli’s De divina proportione. See https://en.wikipedia.org/wiki/De_divina_proportione about the book, and https://en.wikipedia.org/wiki/Rhombicuboctahedron about the geometric solid.Curiously, the word rhombicuboctahedron does not appear in dictionary.com. :-0