I was confronted by three strands of cultural connective tissue this week which portend the death of artistic expression. No, it has nothing to do with the First Amendment or government suppression. It has everything to do with the tearing down of greatness and the worship of mediocrity by the dominant cultural elite. First, Terminal 5 at John F. Kennedy International Airport. Second, the Zurich Opera's production of Richard Wagner's Parsifal. And third, that gaping hole in the ground where New York's World Trade Center once stood