I have finished my final project for the Physical Computing class!
To recap, it is a cluster of four lamps made with multicolor LEDs, each containing a bunch of sensors, a microcontroller and a Zigbee (802.14) radio. Gestures in front of any of the lamps are transmitted to all the lamps, and this changes the color of their display. Depending on which lamp detected the gesture, the colors will be different.
The lamps contain some pretty elaborate code for synchronization and discovery. I may eventually implement a full-blown state machine for gesture recognition, but for now, I’m getting some sleep.
More info is on my ITP blog, look in the Physical Computing category.