Animatemotion inside of a glass hexagon ring. For a challenge at the forum.
https://inkscape.org/forums/competitions/new-challenge-21-september-2021-04-october-2021/
Tried adding a fancy filter to the moving dot but it resulted in a 0,1 fps animation...
so filtering is reduced to screen blending mode on the glass.
Another version, with a slight change of the motionpath to follow the shape more:
https://openclipart.org/download/333547/loop22-glass-animated.svg