Daniel and Nina Libeskind are battling with the various competing interests who want to control what goes up on the site of the World Trade Center. “At issue is their measure of control over what is built at Ground Zero—whether what goes up there reflects Mr. Libeskind’s vision, or the maelstrom of competing interests that has come to define the story of the World Trade Center. If the Libeskinds have one thing going for them, it is themselves. The two—with matching salt-and-pepper hair, glasses, sharp eyes and black clothing—have a way of refracting off each other. They finish each other’s sentences. They interpret each other for their audience. But they are complementary rather than similar.”