The sheet taken off: six drawings, cut into thin strips and woven together.
Toys that make pictures move
Barrier-grid animation
Drag the striped sheet slowly sideways across the picture.
The pictures come to life: the pinwheel turns, the ball bounces and the bird flaps its wings.
Why? The picture is six drawings cut into thin strips and woven together. The sheet’s slits show one drawing at a time, and sliding it shows them in turn, like the frames of a film. Books called Scanimation work this way.
Picture: Drawn by Science Playground · Wikipedia(opens in a new tab)