Compare to isoluminant version
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| The Hering illusion in its original form. The thick horizontal lines are physically straight but appear to be curved as a result of the starburst of diagonal lines creating a perspective effect behind them. Next |
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| This version of the Hering illusion uses animation to illustrate that the horizontal lines are indeed horizontal. The only difference between the two images shown here is the presence or absence of the starburst of lines creating perspective. Next |
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| Cyan lines on a magenta background with the green and blue values for cyan set to 100%. I perceive the "horizontal" lines as curved, just as in the high contrast black and white version presented above. Next |
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| Here the green and blue components of the cyan lines are set to 70%, close to isoluminance for me. To my eyes this has the effect of revealing the straightness of the horizontal lines. Next |
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| Here the green and blue components of the cyan lines are set to 50%, and the horizontal lines still appear to be fairly straight. Next |
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Here the green and blue components of the cyan lines are set to 25%.
I see the "horizontal" lines perceptually curving again.
Back to black and white
Compare to isoluminant version |