Why does Disney Hall need a giant Claes Oldenburg/Coosje van Bruggen tie-and-collar on the sidewalk out front? Christopher Knight writes that “on a digitally fabricated picture of the sculpture on-site, it works like the giant Carpeteria genie or Michelin Man outside a rug shop or tire store — sculpture that functions as a sign. In less than a year, Disney Hall has become perhaps the most famous building in Los Angeles, which means one of the most famous in the nation. You wouldn’t think it needs a sign.”