Chaotick (fire pendulum) by Larry Breed.
In the back, the vertical blue line is That's One Tall Fucking Thing aka the Beanstalk by Mike Light, David Rattray, and Wil Van Hazel. It's a dynamic light sculpture made of a long line of blinking christmas lights hanging from a very high helium balloon. Check my other photos of the Beanstalk.
Photo taken at the Burning Man 2005 festival (Black Rock Desert, Nevada).