The barber pole optical mystery

  Open with LBRY

Series exploring optics: https://www.youtube.com/watch?v=QCX62YJCmGk&list=PLZHQObOWTQDMKqfyUvG2kTlYt-QQ2x-ui
...
https://www.youtube.com/watch?v=0TdBP9m4R74