Graffiti on the Wall: no paint no pain!

Tag everything with your message but without being prosecuted by law is finally a step from being reality.
Those guys from the Graffity Reasearch Lab "[...] are calling all writers in the Netherlands [...] If you’ve ever wanted to catch a 20-story high tag with a laser beam, WE WANT YOU.[...].
So pack your stuff and take the train to the Netherlands.