Dirty Poster.

Osocio points to this clever idea. A seemingly blank, white poster printed with sticky ink, revealing its image over the course of days as air pollution sticks to it. It’s a literal visualization of the crap you’re breathing in. Click the image on their site for a larger version.



It’s an inverse of reverse graffiti, rendering images in polluted urban surfaces by wiping away. For instance, see this video of Alexandre Orion cleaning a São Paulo street tunnel.