Reverse graffiti — removing paint or dirt from a wall to create a pattern — is a hot trend internationally, and many cities have had a hard time figuring out how to handle it legally. Inhabitat reader Aislan pointed us to this cool video of graffiti artists removing exhaust on the tunnel walls to write “For a Clean Porto Alegre.” Police show up, hear the invisible inkers make their case, and end up shielding them from traffic while they work!

(via Inhabitat)

  5:01 pm  |   July 23 2011   |  26 notes