The truth was that the image of the marble dome which her eyes had first discovered so faintly that it suggested a poet’s forehead and thus started a flock of irrelevant ideas, was no figment, but a reality; and as the ship advanced down the Thames before a favouring gale, the image with all its associations gave place to the truth, and revealed itself as nothing more and nothing less than the dome of a vast cathedral rising among a fretwork of white spires.