topology of figure 8 on a stick

By Xah Lee. Date: .

saw this yester night. couldn't figure it out. now after a night's sleep, i understand clearly why.

animation of figure 8 and a pole by Dave Richeson [ https://twitter.com/mathemaniac/status/1270680150506496003 ]
topology of figure 8 on a stick 2020-06-17 jxtjn
topology of figure 8 on a stick
topology of figure 8 on a stick 2020-06-11 4bhff
https://twitter.com/BartoszMilewski/status/1270807013593804800