Rear projection photography

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Rear projection photography is a photographic technique for merging multiple scenes.

A sheet of glass or other material has one or more photographs or motion pictures projected on its rear surface. This side of the glass has a special coating so the image appears bright upon it. The image is then photopraphed from the other side. This was a technique of bringing two scenes together in early movies, such as King Kong, or bringing the action and a different background or backdrop together, long before computers were doing much the same thing.