The Inner Circle



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Both red circles are quite identical. To see this just move the cursor over the image on the left.

This illusion is based on the shape contrast. Red circles have different surroundings which influence their appearance. Our eyes and brain compare each red circle with the circles surrounding it, and in every group determine the dominant element giving it higher value. In this way the red circle in the left group is getting higher value than exactly the same red one in the right group and vice versa. And so their sizes are interpreted as being different.

Last Updated: April 4, 2007   |   Posted: March 27, 2001
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