Spin Art Tables!
See remmler.org/science/playgroup.html from Feb 7th, 2014
Table #1: I placed a plate of golf balls on a crate, held in place with a pvc pipe.
Tray #1: I cut a circle out of cardboard and duck taped pool noodle around the edge.
Table #2: I placed a pizza box on a crate, held in place with a pvc pipe. I added a cardboard track for golfballs, in the pizza box.
Tray #2: I cut out a cardboard circle and taped a hula hoop to it.