New York City, 1959.Photographs by Vivian Maier / Courtesy the Estate of Vivian Maier and Howard Greenberg Gallery “A photograph is a secret about a secret,” Diane Arbus said. In the case of Vivian Maier, the photographer was a secret, too. From the nineteen-fifties until a few years before she died, in 2009, destitute at the age of eighty-three, Maier took at least a hundred and fifty thousand pi