There is a global ‘rash’ of new theatres and especially concert halls, but the fastest growth is in America, a conference of the International Society for the Performing Arts reported last month. Will the boom continue? Historically, “theatre-building is the sort of thing people do at the end of a golden era (as at the turn of the 20th century) when confidence is high and wealth is ample. Now, tax revenues are weak and wealthy donors less wealthy. The curtain may be about to fall, at least for an intermission.”