polýedros
πολύεδρος polyhedron polyèdre polyeder 多面體 многогранник المجسم كثير السطوح poliedro
Wednesday, March 31, 2010
M. C. Escher: Visions of Symmetry (Doris Schattschneider)
M. C. Escher: Visions of Symmetry
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