Animation is a method of creating the illusion of movement by photographing sequential drawings, models, or puppets in fast succession. Our eyes can only retain an image for 1/10 of a second, so when multiple images appear quickly, our brain blends them into a single moving image. Traditionally, animators drew pictures on transparent sheets that were then photographed, but today most animation uses computer-generated imagery. Common types of animation include traditional cel animation, 2D vector animation, 3D animation using computer models, and stop motion animation that adjusts physical objects frame by frame. Popular software used for animation includes Blender, 3D Studio Max, and Adobe Animate.