GR1D is an interactive media facade with forty low-density pixels. Installed outside the main entrance to CalArts in an area of the building's unique waffle-pattern ceiling, the exhibition opened on April 2nd 2012 and closed in early June. Each pixel is a three-by-three foot ceiling lighted by a networked 1-watt RGB LED. GR1D has an interactive interface for passers-by to collaboratively play with the display on their wifi-enabled smartphone or tablet.
Also see the making of video: vimeo.com/57346795
Some juicy details: The entire installation is networked on an I2C bus spanning around 150 feet. I2C line drivers buffer the signal at the top of each row of 8 BlinkM LEDs. The installation is controlled by a single Arduino that interfaces with a server on the campus wifi network. The NodeJS-based app handles the code for user/color/pixel management and serves an HTML5 & websocket-based app.