David Novick's Color Illusion Page: "Impossible" Munker Illusions

This page presents Munker illusions with combinations of colors that, in the examples at the end, seem to be impossible.

The narrow vertical zigzags look strikingly different colors but are actually the same color.
Another "zigzag" color illusion: The colors of the narrow vertical zigzags look orange and salmon but are actually the same color (RGB 255,174,76).
Another "zigzag" color illusion: The colors of the narrow vertical zigzags look fuchsia and violet but are actually the same color (RGB 226,26,242).
Because the Munker illusion is a function of the foreground colors, this "zigzag" illusion works as well even if the dark blue stripes are recolored to a light green! The effect seems impossible, but the actual contrast is with the green stripes and the orange stripes.
Here's a second "impossible zigzag" illusion, where the most salient colors are very close in hue but the actual contrast between foreground colors is large. All of the narrow zigzags are the same color (RGB 244,175,75).
And here's the same combination, this time with a striking blue-green difference in the narrow zigzags, which are actually all exactly the same color (RGB 101,245,151).
Here's the next of the "impossible" zigzag color illusions. The illusion seems impossible because the main apparent colors are so close, and yet the narrow zigzags look red and purple. In fact, both of the narrow zigzags are the same color (RGB 255,54,168).
Here's the next "impossible" zigzag color illusion. The illusion seems impossible because the main apparent colors are so close, and yet the narrow zigzags look greenish and orangeish. In fact, both of the narrow zigzags are the same color (RGB 206,255,64).
Here's the last "impossible" zigzag illusion. In this illusion, the narrow vertical zigzags look violet and blue but are actually the same color (RGB 113, 57, 255).

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

May 18, 2018