I posted last fall about an interesting concept of “reverse graffiti”. Now another artist is doing something similar. Paul “Moose” Curtis is creating art by removing the dirt from tunnel walls by using large custom stencils and a pressure washer. I find this non-destructive and temporary art very intriguing. See also: reversegraffitiproject.com green works cleaners [via Ninja vs. Penguin]

Here is an interesting video in which Alexandre Orion removes dirt to create graffiti.