”One of the neatest things I have seen in the self-expressive miasma that is Burning Man, the countercultural arts festival here in Nevada’s Black Rock Desert, has been The Orb Swarm, a group of spherical robots designed to roll around the playa and interact with participants with lights, motion and sound.”

http://valleywag.com/tech/burning-man/the-orb-swarm-rules-the-night-295729.php