A magic lantern slipping slide showing the metamorphosis of a chrysalis to a butterfly, made by an unknown artist in the 19th century. A slipping slide consists of two or more pieces of glass painted with different stages of a movement. Black patches painted on the movable, or 'slipping', slide alternately cover and uncover the stages of movement. This slipping slide has three parts - the first showing the chrysalis, the second the caterpillar and the third showing the butterfly.