He cast his mind backward and thought of the fluorescent cube which had hypnotised him -- of that, and all which had followed. He had known that his mind was going, yet had been unable to draw back. At the last moment there had been a shocking, panic fear -- a subconscious fear beyond even that caused by the sensation of daemonic flight. It had come from some vague flash or remote recollection -- just what, he could not at once tell. Some cell-group in the back of his head had seemed to find a cloudily familiar quality in the cube -- and that familiarity was fraught with dim terror. Now he tried to remember what the familiarity and the terror were.