True, that recommendation to look at the video. I found the example in Feynman of using a single "ribbon" (a belt) connected to a book to be a much better exam

True, that recommendation to look at the video. I found the example in Feynman of using a single "ribbon" (a belt) connected to a book to be a much better example of a 720° rotational symmetry than this very cool and mesmerizing but also brain breaking video clip of the "ribbon cube"!