Technique of projecting two visual images on a screen at the same time.

The exposure of more than one image on the same film strip.

A shot in which one ore more images are printed on top of one another.

Sometimes referred to as Double Exposure. Two images can be seen at the same time on the screen as they transition from one sequence of actions to another. This occurs when the editor uses a special effect generator or motion projector to simulate the passage of time and space. The method requires a successive number of dissolves to transpose the images at variable lengths of speed.