Showing scale of the universe with Metric A4 paper

Most of the world uses paper called A4, which is slightly narrower and longer than US/Canadian letter paper. The A-series paper has a neat property, because of its dimensions, that if you fold it in half, it will still have the same aspect ratio. So A5 is half of A4, which is half of A3 and so forth. A0 is one square meter in area.

This video I found makes my inner physicist chuckle because it shows the scale of the universe relative to A4 paper. Reminds me of Formi questions for Science Olympiad. It also reminds me of an often cited book in computer science called “A pattern language”, written by an architect named Christopher Alexander, which explores how everything in the universe is repeated patterns that scale.