A4 Paper Is Too Perfect

A CGP Grey video, originally titled Metric Paper and Everything in the Universe, about the A-series paper sizes, where each sheet cut in half keeps the same proportions. It uses paper as a way into the metric system and zooms through scales from the smallest lengths to the observable universe.

HN people share it as a beautiful, educational and visually striking explainer on metric paper, one commenter calling it the most psychedelic experience possible without drugs.

“the most psychedelic experience one can have without doing drugs”