The art collective Le Gun (Steph von Reiswitz, Neal Fox, Chris Bianchi, and Robert Greene) has mounted “Tales from the Void,” a stealthy takeover of the Shakespeare and Company bookstore, that Parisian mainstay. Their installation comprises hand-drawn “sculptural books”—many with fake but disarmingly plausible titles like Encyclopedia of Beatnikism and The Minotaur of Montmartre—hidden among the shop’s shelves.