The brain’s task is to make sense of what the eyes see, and it usually gets it eight. However, optical illusions can play tricks on the brain as it tries to fill any gaps in the visual information it receives.
Pavement painting
Artists can create the illusion of depth by skilful use of techniques such as shadowing and perspective (making lines meet as they would if seen in the distance).
Moving image
This is caused by the eyes’ light-sensitive cells turning on and off as they react in different parts of the pattern. This fools the eye into thinking it is seeing movement.
Picture Credit : Google