"t is unlikely that many people noticed the bearded man in the raincoat and hat as he made his way through New York's best-known galleries and museums. Even if they did, they could scarcely have guessed what he was up to. In each gallery, unseen by staff or security guards, he surreptitiously hung a piece of his own work next to the old masters and big names of contemporary art. Article continues At the Brooklyn Museum, it was a portrait of a colonial-era soldier holding an aerosol can and standing in front of anti-war graffiti. The Museum of Modern Art gained a Warhol-style print of a can of cream-of-tomato soup bearing the Tesco label and the Metropolitan Museum of Art was left with a small, gold-framed portrait of a woman wearing a gas mask. When he reached the Museum of Natural History, the man hung a glass-encased beetle modified with jet fighter wings, missiles and a satellite dish.