For the final sequence of his film Napoléon, Abel Gance introduced a coup de cinéma in which the screen widened to accommodate three images from three interlocked films, an effect he called Polyvision.
The three parts of this triptych were either complementary images
or merged into a single panoramic vision with an aspect ratio of 4:1
For the latter spectacular effect Gance devised a three-camera rig, in which the cameras were mounted one above the other.
Page updated 28 July 2008