Filmmaker Ken Burns gives the annual Nancy Hanks speech at the Kennedy Center. It was a fine speech, writes Phil Kennicott, but rather empty. He gave “what may be studied in years to come as an almost faultless rhetorical exercise in the dying language of Art, Greatness and Inspiration. Burns, the avatar of PBS, speaks beautifully about nothing, using a set of tropes and gentle fictions that, when placed together in almost any order (like refrigerator magnet poetry), seem to take you to Parnassus.”