“Critics will say that photo bombing hardly constitutes ‘art intervention,’ which is the intentional meddling into a pre-existing piece of artwork or even an art venue, like a gallery or museum. (The performance artist who took a hammer to Marcel Duchamp’s famous urinal — titled ‘Fountain’ — in Paris in 2006 and called it his own ‘art’ is a good example of an art interventionist. Same goes for an artist who manages to sneak his work into a museum.)