While not really projection mapping, Javier Lloret writes us with a cool project that transforms a building into an interactive Rubik’s cube via a custom built controller and some LED lights.

In Puzzle Facade the player interacts with the specially designed interface-cube. The interface-cube holds several electronic components inside (an Arduino, six rotary encoders, an IMU, a LIPO Battery and a Bluetooth modem) to keep track of rotation and orientation.

More info: http://puzzlefacade.com