Illustration:
When filming a motion picture, it was necessary to depict an actor emerging completely dry from a lake.
The reverse-filming technique was used: the camera was run in reverse, while the actor, wearing dry clothes, stepped backward into the lake. When the film was played back (in the usual direction), the desired effect was achieved.
Reverse filming is similarly used when filming dangerous sequences, such as depicting a person being hit by a fast-moving car. To film this stunt safely, the actor lies down in front of the car; the camera is then run in reverse as the car backs away and the actor stands up. To achieve a more realistic visual effect, reverse filming is carried out at a slower speed.