http://graffitiresearchlab.com/Dedicated to outfitting graffiti artists with open source technologies for urban communication.
One of their events is:
"The Graffiti Research Lab will be in Rotterdam from February 7th through the 10th (2007). We’re taking control of the Renzo Piano KPN Telecom Building and turning the Kop Van Zuid into the People’s Revolutionary Green Laser Light District. We are turning the 37 x 72 meter screen into a place to display your uncurated animations and graphics"