RT @sbagley: I can watch this video and understand how it is happening but then when I look away from it for more than about 5 seconds I can no longer imagine how it works. https://t.co/LJEvIKpfk0

RT @sbagley: I can watch this video and understand how it is happening but then when I look away from it for more than about 5 seconds I can no longer imagine how it works. https://t.co/LJEvIKpfk0

— Douglas Allen (@DouglasHAllen) Dec 18, 2021

from Twitter https://twitter.com/DouglasHAllen