How to make the optical illusion of paper. Optical illusion. The visual illusion.
Contrast illusion - distorted perception of objects of private signs that occurs when breaking the usual stereotypes, which manifests itself in the re-evaluation features, opposite conventional
Grey diamonds all the same brightness. "Dark" and "light" rhombus is not here.
Optical illusion (visual illusion) - error in visual perception caused by the inaccuracy or inadequacy of the processes unconscious correction of the visual image, as well as physical causes ( "flattened the Moon", "broken spoon" in a glass of water). There is an effect of visual perception when the observer is consciously or unconsciously makes factually inaccurate explanation for the observed pattern to them.