Notorious graffiti artist Banksy recently gathered 40 of his street-art peers to transform a London railway tunnel into an exhibition space. Cheekily dubbed the Cans Festival , the tunnel project came together quickly and has drawn artists from all over the world, including Argentina's Frederico, the Netherlands' Hugo Kaagman, and Norway's Dolk. Banksy himself contributed several pieces to the show, including a painting of a hooded man with a self-inflicted knife wound, a depiction of the Buddha wearing a neck brace, and a sculpture of a tree festooned with CCTV cameras. Elsewhere, a Telegraph writer questions the artist's status as "the Michelangelo of the medium."