Red Bull Creation 2013 finalist: i3 Detroit, RainbowTron
Via Eric Merrill: "i3 Detroit's entry into the 2013 Red Bull Creation contest, the RainbowTron. The RainbowTron is a large, touch interactive, LED board. It has 426 individually addressable RGB LEDs. The current software is a matrix sequencer, allowing you to place audio samples across the board, building up beats and music."