How Animation Works
Animation is made from individual images. Regardless of how motion is created in an animation, an animation is still a collection of fixed images. Suppose you see a car drive by. You see the car throughout the entire time it's within sight, but you are likely to blink. Your brain covers up the fact that you missed part of the action. When you watch a movie or television, the screen is blinking very fast—sometimes it shows an image, and other times it's black. The fact that the black moments are so short makes you think you're watching full motion.
The image projected onto the retina of your eyes remains even after the light stops. If you close your eyes, the last thing you saw remains imprinted for just an instant, and then it fades. This persistence of vision is why you don't notice the blank spots between frames
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