"Prosper's earliest memory was of hearing the enormous Hoover starting up somewhere in the house, brand-new then possibly, anyway unknown to him, an inexplicable noise at once a roar and shriek and coming closer; moving away; closer again, and evidently seeking him out where he lay in bed. Then to find the great gray floor-sucker thing entering his room, manipulated by his grim-faced mother, therefore not dangerous at all, maybe."