David Novick's Color Illusion Page: Reverse Munker Illusion

The Munker illusions at David Novick's Color Illusion Page present apparent differences in color between two circles that are actually the same color. But the principle of the Munker illusion can be applied to create two circles that appear to be the same color when in fact they are different colors. I call this the reverse Munker illusion.

The figures below show five examples of the reverse Munker illusion. While the mechanism of the Munker illusion is understood (see my explanation of the illusion), I find that crafting reverse Munker illusions is frustratingly difficult. Some of the color matches of the center circles are less exact than others, but in all cases the difference between the actual colors of the center circles is much greater than the minor differences between their apparent colors.

To my eyes the circles (behind the stripes, not the circles overall) look roughly the same violet.
But the central circles are actually salmon and purple.
To my eyes the circles (behind the stripes, not the circles overall) look roughly the same dark green.
But the central circles are actually green and blue.
To my eyes the circles (behind the stripes, not the circles overall) look roughly the same brown.
But the central circles are actually green and rose.
To my eyes the circles (behind the stripes, not the circles overall) look roughly the same violet.
But the central circles are actually green and purple.

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Department of Engineering Education and Leadership | The University of Texas at El Paso

August 1, 2017