Chromostereopsis
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Chromostereopsis is an effect in human vision where some specially colored images have a differing depth effect. It happens because of diffraction of different colored light in the human eye.
Red light and blue light entering the eye spread out at slightly different rates, making blue objects and red objects seem slightly larger or smaller compared to each other.
By squeezing one's upper eyelids each with a finger and a thumb, the distance effect of a chromostereogram can appear to change. This is because of the diffraction effect.