penrose |
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navigate by keyword : bars black geometrical geometry heptagon hexagon illusion illustration impossible line object octagon optical outline penrose pentagon polygon science septagon solid square straight symbol triangle tribar visual white |
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Penrose triangle and polygons outline. The Penrose tribar, an impossible object, appears to be a solid object, made of three straight bars. Further square, pentagon, hexagon, heptagon and octagon. |
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