The Infernoptix Digital Pyrotechnic Matrix is a 96-inch display "screen" with 6" bursts of fire as pixels. Designed by tech/art firm NAO, the computer-controlled system can act as a firey scrolling sign, sketch pad, audio level meter, and also a percussive instrument that plays out the bursts in rhythm. From the project description:
Each fire pixel has a corresponding valve nestled in the frame of the screen and turned on or off by commands from the software. The Infernoptix is typically fueled by propane, but can be run on natural gas as well. Fuel tanks are stored externally and connected by hose to the sign and valves. Fuel consumption varies widely but with propane averages 15 gallons per hour. The screen itself measures 4'2" high by 7' wide by 1' deep, and is constructed of steel and copper. Total weight is 450 pounds, not including the stand, which is removeable for transport or alternate installations.
Link (Thanks, Jason Tester!)
