It was not only because this state was a pleasant one. It was principally because (just as increased tension upon a cord or accelerated vibration of a nerve produces a different sound or colour) it gave another tonality to all that I saw, introduced me as an actor upon the stage of an unknown and infinitely more interesting universe; that handsome girl whom I still could see, while the train gathered speed, was like part of a life other than the life that I knew, separated from it by a clear boundary, in which the sensations that things produced in me were no longer the same, from which to return now to my old life would be almost suicide.