In case you hadn’t noticed, LEDs are big these days. In Brussels, the Dexia Tower office building uses that many LEDs to illuminate the entire building. A computer controls the display, which sometimes encodes the next day’s weather forecast, and other times just displays a static or moving pattern.
Each window is illuminated by a row of 12 RGB LEDs along the bottom of the windowpane. To properly light the building the blinds must be closed — they are controlled by a computer as well.
For a couple weeks after the building opened in December 2006, passers by on the street were able to interact with the LED display via a multi-touch screen. They were not, apparently, able to play Tetris however.
Recently, in a cost cutting measure, the display has been cut back to 10 minutes each hour from sunset to midnight. There are many videos on youtube you can watch to see the lights in action.
Design News Gadgeteer