"When is cleaning the sidewalks a crime? When you’re doing it to create art. Obviously.
A number of street artists around the world have taken to expressing themselves through an innovative practice known as Reverse Graffiti. Taking a cue from the “Wash Me” messages scrawled on the back of delivery trucks, they seek out soot covered surfaces and inscribe them with images, tags, and even advertising slogans using scrub brushes, scrapers and pressure hoses.
On a more overtly environmental bent, Brazilian Alexandre Orion, turned one of Sao Paolo’s transport tunnels into a stunning mural last summer. The mural, comprised of a series of skulls, very succinctly reminds drivers of the impact their emissions are having on the planet. "
The article and more photos at inhabitat.com