The Penrose triangle, also known as the Penrose tribar, is an impossible object. It was first created by the Swedish artist Oscar Reutersvärd in 1934.
I have always been fascinated with two dimensional illusions like this Penrose triangle and other types of impossible shapes, especially in the work of M.C. Escher. This was just an experiment in Illustrator: playing with the pen tool and patterning methods.
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