But these words, as they dived down through the waves of sleep in which Swann was submerged, did not reach his consciousness without undergoing that refraction which turns a ray of light, at the bottom of a bowl of water, into another sun; just as, a moment earlier, the sound of the door-bell, swelling in the depths of his abyss of sleep into the clangour of an alarum, had engendered the episode of the fire.