How a Notebook Became a Film Projector

Animated Short, 1:19. Published 2026-11-11.

How does a film projector work? Start with a flip book in a notebook.

How a film projector works, step by step, starting from one notebook flipbook. Along the way the film catches fire. A wheel shaped like a cross stops each frame 24 times a second, and a spinning shutter hides every move, so in old cinemas the screen was black about half the time.

The steps: flipbook, zoetrope, magic lantern, film strip, Maltese cross (Geneva drive), shutter, two-blade shutter (48 flashes a second), Latham loop, nitrate film fires, safety film, and today's laser projectors with mirror chips (a 4K cinema chip has about 8.8 million mirrors).

So who wins: the LASER or the NOTEBOOK? 👇

Transcript

Flip a notebook, and this little man runs. Now let's put him on a cinema screen. But careful. The film catches fire. First problem. Only you can see him. So you spin the pages in a drum with slits. But only a few heads fit around it. So you paint him on glass, and a lamp throws him on the wall.

But glass can't move. So you print him on a long strip of film. Film that burns like gunpowder. Pull it past the lamp, and he's one big smear. So a wheel shaped like a cross yanks one frame down, and freezes it. But now he jumps. So a spinning blade hides every move. But now it flickers.

So you add a second blade. Now it's too fast for your eyes. But all that yanking rips the film. So you leave a loose loop above and below. Then the lamp gets hot. Remember the gunpowder? It bursts into flames. It even burns under water. So you switch to safety film. And the weird part?

The screen was black half the time. You never noticed. Today the film is gone. A laser hits a prism that splits it into red, green and blue. Each color gets a chip of tiny mirrors. So who wins? The laser, or the notebook?

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