http://en.wikipedia.org/wiki/3-D_film#Early_systems_of_stereoscopic_filmmaking_.28pre-1952.
"The earliest confirmed 3-D film shown to a paying audience was The Power of Love, which premiered at the Ambassador Hotel Theater in Los Angeles on September 27, 1922. The camera rig was a product of the film's producer, Harry K. Fairall, and cinematographer Robert F. Elder. It was projected dual-strip in the red/green anaglyph format, making it both the earliest known film that utilized dual strip projection and the earliest known film in which anaglyph glasses were used. Whether Fairall used colored filters on the projection ports or whether he used tinted prints is unknown. After a preview for exhibitors and press in New York City, the film dropped out of sight, apparently not booked by exhibitors, and is now considered lost."
Humanity surprises me from time to time
