I think this piece pictured that I made about a thousand years ago (give or take a year), is one of my favorite things I've ever made. Super simple: cups being blown by little computer fans. It was called "details of a perfect story" which I still think is a good title and explains what the cups are up to just about as good as I can.
I'm playing around with a new version, where maybe down the line everyone could draw a picture on their cup, throw a little device in it, and then place it in a room and watch as their cup and a 1000 others danced around on the floor in a windless room.