Why Topology Matters: The Inscribed Rectangle Problem
3Blue1Brown · Explainer · 17 min · 2016 · YouTube title: Who cares about topology? (Old version)
Why it's here
Fans name it as a favorite 3Blue1Brown video, praising its detective-story treatment of the inscribed square and rectangle problem.
What it covers
An older 3Blue1Brown video on why topology matters, built around the inscribed rectangle problem. It walks through how tori and Mobius strips appear in the solution. The channel later replaced it with an updated version.