Indeed, film is not just all direction and writing, handed down from above, and the rest falls into place. Directors often work with the same groups of people on their team, and it's not just because of nepotism or working familiarity -- Christopher Doyle brings as much to each Wong Kar Wai film as the director himself; Bela Tarr leaves the music completely up to Mihaly Vig (an integral part of his movies).