A flip book is a simple animation tool that consists of a series of images printed on pages. When the pages are flipped rapidly, the images create the illusion of motion, similar to a short film. This technique relies on the persistence of vision, where the human eye perceives a series of still images as continuous movement. Flip books can be made from various materials, including paper and cardboard, and are often used for entertainment or educational purposes. They can feature anything from simple stick figures to complex illustrations, making them a popular choice for artists and animators, such as Walt Disney in the early days of animation.