If graffiti is a crime, what about cleaning? What if you clean selectively, removing only the bits that don’t make art? placeboKatz:
Alexandre Orion is cleaning São Paulo’s tunnels by scraping the deposited vehicle exhaust soot from the walls to make hundreds of sculls. Even so police turned up several times they couldn’t do much as cleaning is no crime. After some time the São Paulo municipal started their own cleaning mission, consequently only cleaning the parts already cleaned by Alexandre. Again the skulls appeared on the remaining soot canvas and this time the city decided to clean all tunnels.
More images, and an interesting bit on our glib acceptance of living amidst our own pollution, at the artists’ site.