Optical Illusion
My own Optical Illusion
In this illusion, it
appears that there is one set of black letters and one set of
white letters. In fact, the two sets of letters are exactly
identical. They appear different because the surrounding regions
they are on cause the visual system to segment the images into
layers. Thus one set appears to be white letters behind dark
clouds, and the other set appears to be dark letters behind
light clouds. If you cut out the letters you will see that
they are identical!

Optical Illusion

Explanation
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