It is true that hypnosis can also be evoked in other ways, for instance by fixing the eyes upon a bright object or by listening to a monotonous sound. This is misleading and has given occasion to inadequate physiological theories. As a matter of fact these procedures merely serve to divert conscious attention and to hold it riveted. The situation is the same as if the hypnotist had said to the subject: 'Now concern yourself exclusively with my person; the rest of the world is quite uninteresting.' It would of course be technically inexpedient for a hypnotist to make such a speech; it would tear the subject away from his unconscious attitude and stimulate him to conscious opposition. The hypnotist avoids directing the subject's conscious thoughts towards his own intentions, and makes the person upon whom he is experimenting sink into an activity in which the world is bound to seem uninteresting to him; but at the same time the subject is in reality unconsciously concentrating his whole attention upon the hypnotist, and is getting into an attitude of _rapport_, of transference on to him. Thus the indirect methods of hypnotising, like many of the technical procedures used in making jokes, have the effect of checking certain distributions of mental energy which would interfere with the course of events in the unconscious, and they lead eventually to the same result as the direct methods of influence by means of staring or stroking.[58] Ferenczi has made the true discovery that when a hypnotist gives the command to sleep, which is often done at the beginning of hypnosis, he is putting himself in the place of the subject's parents. He thinks that two sorts of hypnosis are to be distinguished: one coaxing and soothing, which he considers is modelled upon the mother, and another threatening, which is derived from the father.[59] Now the command to sleep in hypnosis means nothing more nor less than an order to withdraw all interest from the world and to concentrate it upon the person of the hypnotist. And it is so understood by the subject; for in this withdrawal of interest from the outer world lies the psychological characteristic of sleep, and the kinship between sleep and the state of hypnosis is based upon it.