The image has by now become iconic: a 1,500-pound section of cinderblock and concrete from the Packard Plant depicting a child with a paintbrush next to the words: "I remember when all this was trees." When the 555 Gallery crew hauled it out of the hulking building in 2010, they initially claimed they hoped to preserve it. Turns out the street art world frowns on people taking possession of street art, especially if they want to sell it. Some experts said the piece could sell for as much as $1 million. The tony Los Angeles auction house putting it on the block said $400,000. In the end, after all the controversy, the section of wall sold for less than $140,000, and the gallery pocketed even less.