The Washington Post recently carried out an unusual experiment. It hired Joshua Bell, one of the world's most famous classical musicians, to dress like a common street busker and play his Stradivarius in a D.C. metro station during rush hour. The anonymous Mr. Bell played Bach, he played Schubert, he played some of the most beautiful music ever to emerge from the minds of mortals. And virtually nobody stopped to notice. The point was not that most people are uncultured clods. The point, rather, is that we are so caught up in the routine of our lives that we fail...