The audience plays a huge part in how a piece will actually form. They really allow the performers to walk a tightrope in a way that never seems to happen in the privacy of your own four walls. I'm listening to the audience, and they're listening to me. ↗
Perhaps my favourite story is 'Le Passe-Muraille' by Marcel Ayme. It's about a guy who wakes up with a weird faculty that means he can walk through walls. He's a very shy clerk, and he uses it to get revenge, or vent his frustration. ↗
Building walls isn't going to work in the long run. Some people are happy with the wall in Israel, but somebody will get a weapon someday and knock it over or something. Walls aren't the answer between countries, though. ↗