From 1939, this peculiar invention split images on screen, via a rotating shutter disk, which alternated between an opening and mirror; the opening projecting a frame of film in a traditional fashion, the mirror reflecting a frame to a moveable secondary mirror and on to a specific area of the screen (controlled by the projectionist). Aside from a one-off novelty screening, the idea never found a market and slipped in to the realm of cinema oddities.
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