A house-sized version of Rubik's Cube called Groovik's Cube appeared on the desert at Burning Man 2009. It's lit from the inside by 648 bright LEDs, and is 15 feet in each dimension. Unlike a normal Rubik's Cube, though, this variant has three controllers on three different sides, which means that solving the puzzle means all three people at the controls have to cooperate. It also requires a good memory, because each person can't see the far side from their own controller. One successful effort involved shouting commands and runners going back and forth.