Persistence of Vision in Animation

"Hi, this is Cable on behalf of Expert Village. A simple animation even if it is a flip book or a bouncing ball animation or a complex Disney animation it is still based on the same principle. That principle is the persistence of vision of persistence of memory and all this is that. There is a rapid of images one right after the other that for a moment a retained in the brain. Take for example a ancient parlor device called a zoetrope. It simply has one image on each side of the card connected with a string. For this example there is a bird on one side and a cage on the other. At first glance they are totally separate images but if the 2 images are rapidly alternated and the more you spin the faster the images are intermediate shown. To the brain and to the eye it looks like the bird and the cage are one image and we know that is not true. That is the illusion of movement. It is the same principle when you are doing a bouncing ball animation."