Sprocket holes are small, evenly spaced holes that you can find on film strips or in the edges of photographs. They help in the process of advancing the film and keeping it properly aligned in cameras or projectors.
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Among the masks used in JG is one that references the template and
sprocket holes of a strip of 35 mm Ektachrome slide film.
The Dolby Digital soundtrack resides in the spaces
between sprocket holes on 35 mm prints, next to the analog soundtrack.
To install timing belts, I use wooden clothespins (the spring loaded ones), because they're narrower than binder clips so they fit
through sprocket holes, and they have a longer reach.
Each subsequent projection repeats the process of optically reprinting the film seen to its left, accumulating sets of
sprocket holes as they progress.
It is framed at the edges
with sprocket holes, so we feel we are looking at a vast reel of film.
On a technical note, the production was shot using three - perf film (normal 35 mm motion picture stock but the image area takes up three instead of the standard four
sprocket holes), thereby using 25 % less film and chemicals to shoot and process.