Hollywood's attempt at besting the small screen TV format, that was causing reduced ticket sales, also included innovations in stereophonic soundtracks and the much-balyhooed premier of so-called 3-D movies. The first, "Bwana Devil", hit the silver screen in late 1952. The 3-D process, which gave the illusion of depth perception, was accomplished by disposable, cardboard "anaglyph glasses", which were worn by the audience.
Poster from Wikipedia / "PhilbertGray"
Photo from Wikipedia / "Snaily"