On a recent spring morning, some 90 minutes before the Metropolitan Museum of Art opened, Dave Krugman, a 26-year-old photo retoucher from Bushwick, Brooklyn, ushered six friends into its cavernous halls through a side door near East 81st Street. Unimpeded by crowds, they roamed the world-famous exhibitions. Mr. Krugman photographed his fellow adventurers posing above […]