When we go to the theatre, we understand that we are doing something different. It is not just that sitting and watching others for two hours is different than other daily activities. It is that theatre itself is a particular social setting, obeying its own rules and operating by its own standards. That difference makes theatre feel free and unencumbered by many of the things that tie us to society and the world in the rest of our lives. And yet, of course, this feeling is misleading. Theatre may be distinct, but it is still connected to the wider world. Performances may be built out of the forms, ideas and material from the 'real world', and as audience members, we may take the experiences, stories, and insights we find in the theatre with...