Films are produced by recording actual people and objects with cameras or by creating them using animation techniques and special effects. They comprise a series of individual frames, but when these images are shown rapidly in succession, the illusion of motion is given to the viewer. Flickering between frames is not seen due to an effect traditionally known as persistence of vision, and now more specifically known as flicker fusion, whereby the visual system processes a sufficiently fast succession of pictures and interruptions into a steady image of averaged brightness.















































