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Powers of Ten™ (1977)
Eames Office

The Eames Office's 1977 film Powers of Ten starts at a picnic in Chicago and zooms out by a factor of ten every ten seconds to the edge of the universe. It then zooms inward to a proton in a carbon atom.
HN commenters recommend it as the classic visualization for building intuition about scale, and it comes up whenever a thread concerns scale or size comparisons.
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