When age fell upon the world, and wonder went out of the minds of men; when grey cities reared to smoky skies tall towers grim and ugly, in whose shadow none might dream of the sun or of spring's flowering meads; when learning stripped earth of her mantle of beauty, and poets sang no more save of twisted phantoms seen with bleared and inward-looking eyes; when these things had come to pass, and childish hopes had gone away forever, there was a man who travelled out of life on a quest into the spaces whither the world's dreams had fled.