Street art is no longer considered merely a public eyesore, and artists such as Banksy and Shepard Fairey have legitimized street art by making it profitable.
However, there are still plenty of street art masterminds out there who are more concerned with making the urban environment more colorful than making millions of dollars.
Peregrine Church is one of these humble proponents of urban art fun, and his innovative technique leaves the city sidewalks looking squeaky clean- until it rains.
Church uses hydrophilic chemicals (activated by water) to create his whimsical pieces, and these chemicals last "anywhere from four months to a year", so his Rainworks won't stain the sidewalk forever.
-Via Beautiful/Decay