Oh! That's not the whole video! It's a nice introduction to topological invariants (turning number in the case of curves, "smiles" + "frowns" - "saddles" in the case of surfaces).
Heheh yeah the whole video is really good but that bite sized chunk activates the hmm without the need to pay attention for too long But heheh to those interested the whole vid is :think_emoji: and narration style is kinda off and that's p funny