Magic lantern slide: Exploding pie

A magic lantern slipping slide showing an exploding pie, made by an unknown artist in 1870. The slide shows a man carrying a pie that has exploded to reveal its contents - a cat and a dog. The first slide in the pair shows the man carrying the pie before it exploded.

A slipping (or slipper) slide is designed to give movement to a still drawing to reveal something which was previously hidden. There are two main types of slipping slide, single and double. With the single slide, the action is produced by sliding one glass in front of another. - two glasses are mounted in a wooden frame, one of which is fixed and the other moves across it. The movable glass is called the slipping glass and can be moved usually into two final positions to mask off then reveal part of the image.