Here’s an illusion published by B. F. Skinner [1]. Just stare through a pinhole at a tangent point (where two circles meet) in the pattern below, and the circles will take on various pastel colors. Viewing distance should be about 18 inches. No preconditioning by a "Skinner box" is required. By the way, I can see colors without using a pinhole.
Click the image to download a full sized graphic.What colors do you see? Can you find a presentation that accentuates the colors? Any explanation for the effect? Please post your thoughts.
[1] B. F. Skinner, A paradoxical color effect. Journal of General Psychology 1932; 7:481-82.
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