Persistence of Vision... =)

Persistence of vision is the phenomenon of the eye by which an afterimage is thought to persist for approximately one twenty-fifth of a second on the retina. 

It is a mistaken belief that human perception of motion is the result of persistence of vision. A more likely explanation to motion perception are two distinct perceptual illusions; phi phenomenon and beta movement. 

The phi phenomenon is an optical illusion in which the persistence of vision formed a part of the base of the theory of the cinema. The illusion is based in the principle that the human eye is capable of perceiving movement from pieces of information, such as a succession of images.

Beta movement is a perceptual illusion in which starting from a core fund, shows static images that vary, and combined by the brain creates a sense of movement.

Combining these two illusions together, creates a persistence of vision which allows us to see sequences of images as one, therefor seeing moving images.

Looking at the cross in the middle of the image below, all of the pink dots disappear and all you see is one green dot moving around in a circle. This is an example of persistence of vision.