The Chromostereopsis Illusion is an optical illusion that occurs when two images of the same object are viewed with different colors. It is caused by the difference in the way the eyes perceive the two colors, resulting in an illusion of depth or three-dimensionality. The illusion is most
From Wikipedia
Chromostereopsis is a visual illusion whereby the impression of depth is conveyed in two-dimensional color images, usually of red–blue or red–green colors, but can also be perceived with red–grey or blue–grey images. Such illusions have been reported for over a century and have generally been attributed to some form of chromatic aberration.