People are awesome & Math is beauty
The white circles albeit traveling in a straight line across the circle exhibit a more collective circular behavior.
Here’s a much more real world scenario which follows similar guidelines:
If you notice, the motion of all the workers individually are also periodic in nature, but each of their motion is slightly out of phase leading to this beautiful symmetric behavior that constitutes this gif.
The mathematical sciences exhibit order, symmetry and limitations; and these are the greatest forms of the beautiful
** Radial engines too BTW: