Open City is an exhibition about the tools and methods employed by graffiti writers, street artists, activists, and pranksters. Come drink free beer and watch videos of people break'n da law. Video documentation and tools by the following artists will be on display:

laser pointer + projector on giant building = immense graffiti

video and some text that doesn't explain much.

also - a tricycle w/ speakers attached for roving street parties 

Devising digital techniques for graffiti artists

By Geeta Dayal The New York Times Published: June 23, 2006

NEW YORK This city may have given birth to modern-day graffiti art, but how is it keeping up with the times?   Graffiti in its traditional form, involving aerosol cans of spray paint and an inviting flat surface, still dominates on the streets. But online things are evolving quickly.