Mulitiverse is a monumental scale LED light show installed in the National Gallery of Art. If you happen to be in the Washington area, you really should check it out. The website has some great videos Multiverse in action.
Multiverse, the largest and most complex light sculpture created by American artist Leo Villareal, may be seen and experienced by visitors as they pass through the Concourse walkway between the East and West Buildings of the National Gallery of Art. Commissioned by the Gallery and on view until November 2009, the work features approximately 41,000 computer-programmed LED (light-emitting diode) nodes that run through channels along the entire 200-foot-long space. The development of this LED project began in 2005, and the installation created by Villareal specifically for this location began in September 2008.