Richard Pettibone, creepy as it may sound, has made a career of appropriating Andy Warhol's art. He's done paintings of Marilyn Monroe and Little Electric Chair and now, in a show titled "Paintings of Sculptures" at Leo Castelli Gallery through May 23, Pettibone has painted Warhol's series of box sculptures, which Warhol himself re-created several times. Here, a diptych of Warhol's Kellogg's Cornflakes boxes, which produces an effect similar to those Magic Eye posters. —Emma Pearse