bourdon |
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| navigate by keyword : bourdon illusion angle bent line optical visual perception straight obtuse triangle triangular view pattern shape arrangement form figure unreal effect phenomenon paradox recognize cognition stimulus illusory vision geometric geometry experiment irrational interpretation reality relative illusions psychology science education research isolated white background vector |
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| Bourdon optical illusion. Angle illusion where a straight line is perceived as slightly bent at an obtuse angle. The illusion effect does not appear as pronounced with horizontal and vertical figures. |
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