<http://schema.org/about>
"Guerrilla gardeners in New York have seized the opportunity created by the city's crackdown on illegal advertisements to promote their own cause on the now-empty billboard spaces: greening the urban jungle, one pop-up wall garden at a time."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/urban-design/nyc-guerrilla-gardeners-turn-billboard-blight-into-pop-up-planters-in-four-easy-steps.html>