Man on the street
I recently came across a similar work of graffiti art called the "Toynbee tiles". I vaguely remember seeing something on the street at the corner of Smithfield street and Forbes Avenue, but I never paid much attention to it. Apparently the tiles are in a lot of major cities, and speculative roots are in philly. It’s this weird license-plate sized box that makes reference to toynebee‘s idea about striving towards the future and always having goals that are almost impossible. There’s also something in there about colonizing Jupiter like the movie 2001 space odyssey.
Here’s a link to the post gazette story – http://www.post-gazette.com/pg/06151/694320-42.stm and to the wikipedia article – en.wikipedia.org/wiki/Toynbee_tiles843 views