If I were to ask you to perform in a play that I’d written, before a live audience with a month of rehearsal, I suspect that most of you would say no. What if you got stage fright? What if you forgot your lines? What if the audience booed? But at least a conventional play has structure. Every word and movement has been scripted. Every performer gets to rehearse. There’s a director in charge, telling everyone what to do. Now suppose that I were to ask you to perform again before a live audience—only this time without a script, without any clue as to what part you were playing or what you were
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