Enginner Guy Bill Hammack is a master at taking seemingly-boring technology, and breaking down the components and manufacturing process until you’re left with nothing but respect for the engineers who designed it.

The film projector is no exception — rather than just rolling a series of frames in front of a light, a projector has to sync the frames, move them intermittently, and then block the light as the film moves. The result is a masterpiece of not-so-modern technology, and a healthy newfound respect for engineers working before computers were a thing.

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Contact the author at chris@gizmodo.com.

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