When an image is shown to the eye for a fraction of a second, the image persists in the visual memory for a short period.
The concept behind flipbooks is based on the persistence of the vision principle. It is a primitive form of animation that predates the invention of motion picture film. A flip book, also known as a flipbook, flick book, or thumb cinema, is a small book-like object that contains a series of sequential images that, when flipped through rapidly, create the illusion of motion or animation.