How are these circles not moving?

Question

See the below post. The circles are stationary…

https://www.reddit.com/r/gifs/comments/k0tiue/the_circles_are_stationary/?utm_source=share&utm_medium=ios_app&utm_name=iossmf

In: Other

Answer 1

Each segment is leaving a “tail” of its own color over the next segment. Thus when it rotates from one segment to the next the next segment actually is moved a little bit to the side by one pixel. The tail does not go all the way around though so you could say that it “moves back” before reaching the third segment.

You do see it actually move over but you don’t see it move back so instead of vibrating it has the illusion of only moving in one direction.