This amazing video by CGP Grey starts off as a seeming ode to the dimensional metric wonders of A4 paper and all of larger and smaller A-size papers that can be made by simply folding (or unfolding) a sheet.
But then things get seriously mind-expanding as they keep folding and folding that sheet of A4, down to the quantum level and beyond, and then back to the A4, and expanding it out beyond the known universe.
You’ll never look at an A4 piece of paper the same way! Trippy and enlightening stuff.
[H/t Blake Maloof]
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