I’m going through some obvious ones as I begin. But here’s one that we can all agree on: Everything that happens to the audience is part of the show. How frustrating it is to have terrible, pushy ushers. No wonder we always want to design the auditorium, or to stage our plays in found, appropriate spaces. And when these things are out of our control, how hard the directors work to define the edges of their work. Curtains, blackness, musical sections for the beginning and ending. But you can’t get away from it: the audience still step out into the National Theatre (or the backroom of a pub) after the show.. if you can’t make it your own you still need to find a way to counteract or respond to it.