I started a group a while back called
Moving Artists for art pieces like this (and this would be a perfect fit), but it never got off the ground.
"
This group
manages the "Kinetic Art & Sculpture" category. Kinetic art is art
that contains moving parts or depends on motion for its effect. The
moving parts are generally powered by wind, a motor or the observer.
Kinetic art includes Mobiles, Wallables, Gyros, Wind Art, and other art
that moves."
I know there are other art categories for stuff like this, but I think these pieces could stand alone as a distinctive subset, and could be better highlighted in its own category. Maybe there's interest again?