Polyvision
Sign in to savethumb|right|300px|A triptych scene of Napoléon (1927), showing its two vertical seams. Polyvision was the name given by the French film critic Émile Vuillermoz to a specialized widescreen film format devised exclusively for the filming and projection of Abel Gance's 1927 film Napoléon, its three-projector format predating Cinerama by 25 years.
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thumb|right|300px|A triptych scene of Napoléon (1927), showing its two vertical seams. Polyvision was the name given by the French film critic Émile Vuillermoz to a specialized widescreen film format devised exclusively for the filming and projection of Abel Gance's 1927 film Napoléon, its three-projector format predating Cinerama by 25 years.
Polyvision involved the simultaneous projection of three reels of silent film arrayed in a horizontal row, making for a total aspect ratio of 4:1 (1.×3). Polyvision's extremely wide aspect ratio was the widest aspect ratio yet seen, even though it is technically just three images side by side. In 1955, the Walt Disney Company developed Circle-Vision 360° for use in Disneyland theme parks which used nine 4:3 35 mm projectors to show an image that completely surrounds the viewer.