There is a trapdoor on Christ's right shoulder. To mount the steps and slowly, fearfully peer out is to see the world through the eyes of a bird, or even a god. Far below, white blocks of flats and offices cluster among folds of tropical green. Down there are the poor in the favelas, the rich in the luxury high-rise apartments, the homeless, the famous football stadiums and Guanabara bay with its scattered islands and boats. Beyond the sands of Copacabana and Ipanema, the limitless Atlantic ocean. To the left, standing twice a man's height, is the slightly bowed head...