“For many years the Hirshhorn Museum and Sculpture Garden, a part of the Smithsonian museum empire, has been identity-free. The Hirshhorn has never equaled the National Gallery of Art’s prestige and has never become as beloved as the Phillips. It’s long been a humdrum museum bunkered in an abominable Gordon Bunshaft building, with a so-so collection and a so-so exhibition schedule. Still, the Hirshhorn has always had great promise…”