Banksy spray-painted a live elephant at an exhibit in 2006 also as a tribute to Cornbread, who did so illegally at the Philadelphia Zoo in 1970. This presumably first graffiti writer wrote “Cornbread” on walls in prison to protest against the lack of cornbread. In 1967 he continued painting this word as a tag on the street. Before that, only gangs did that. Illegal urban guerrilla ego advertising was as new as its medium: felt-tip pens and spray cans had barely been ready for the market before.