People are organized into theme camps. There was the Lego camp with 1000's and 1000's of legos to play with. There was Radio-Free Burning man (actually several pirate stations broadcast in the desert), The Pinata Fuckers Camp, Camp Atari (yes, they had Ms. Pacman). There were over 400 theme camps, each with its own piece to add to the Gestalt creative Milkshake.
I was with Fraycamp. We were an offshoot of www.fray.com that invited people to contribute to a project of personal storytelling.