Multiple Exposures
Exposing the same film frame again and again results in a negative that is a composite of all the individual exposures.
Superimposition of images can be done during production, by shooting the first sequence and then rewinding the film to reshoot over it again. They can also be shot separately and combined later in post-production by using the optical printer to impose the images on one another.
The purposes of such effects can express a passage of time and/or exhibit parallel events occurring at the same time.
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