SketchUp make the penrose triangle becoming a real object ! In fact it is not made of "made of three straight beams of square" but it exists in 3D and not only in 2D.... See Front and Back views and turn around to see how looks like a real penrose triangle in 3D space^^ #3D #figure #geometric #géometrique #illusion #math #mathematics #maths #optic #optical #optics #penrose #perspective #shape #Sketchup_8 #triangle #visual
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