In Tennyson's tale of the Holy Grail, a knight searches high and low for that which lasts for eternity and gives ultimate meaning. He comes upon a singing brook, with deep meadows and wonderful fruit trees. But even as he ate the fruit, it turned to dust, for no feeding of the flesh could still his deepest hunger. Riding on, he saw a home, its opened door a promised welcome and in the door there was a beautiful woman, her eyes …