This was a couple years ago at their old location a couple blocks off downtown Oakland. The had a tube of clear plastic (like plastic bags are made of, not solid) suspended under a recessed ceilling light, and the bottom of the bag was wrapped over a fan, with the bag cinched in a little a couple feet above the fan. The fan was turned on, and some feathers were put in the bag. The feathers would dart around about chest level, lookin glike fish schooling in an aquarium.
I always thought that was a very cool and cheap lighting idea, and I would love to find more nifty things like that.
So, any pointers? :-)