In pursuit of similarly upbeat subjects-loneliness, longing-Keaton began photographing empty hotel lobbies 15 years ago. She made a book of the images and realized it was like making a film. She directed TV and a documentary, “Heaven,” before landing “Heroes.”

Has Keaton, 49, learned anything from two actor/director ex-boyfriends? She credits Woody Allen for her “disarmingly simple” directing style. But she hadn’t seen Warren Beatty for two years when he popped by her editing room recently-so she threw him out. “He was so surprised,” she laughs. The world may be too much with her, but Keaton still gets in her la-dee-dah.