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The theme of the ‘double’ has been very thoroughly treated by Otto Rank (1914). He has gone into the connections which the ‘double’ has with reflections in mirrors, with shadows, with guardian spirits, with the belief in the soul and with the fear of death; but he also lets in a flood of light on the surprising evolution of the idea. For the ‘double’ was originally an insurance against the destruction of the ego, an ‘energetic denial of the power of death’, as Rank says; and probably the ‘immortal’ soul was the first ‘double’ of the body. This invention of doubling as a preservation against extinction has its counterpart in the language of dreams, which is fond of representing castration by a doubling or multiplication of a genital symbol. The same desire led the Ancient Egyptians to develop the art of making images of the dead in lasting materials. Such ideas, however, have sprung from the soil of unbounded self-love, from the primary narcissism which dominates the mind of the child and of primitive man. But when this stage has been surmounted, the ‘double’ reverses its aspect. From having been an assurance of immortality, it becomes the uncanny harbinger of death.

The idea of the ‘double’ does not necessarily disappear with the passing of primary narcissism, for it can receive fresh meaning from the later stages of the ego’s development. A special agency is slowly formed there, which is able to stand over against the rest of the ego, which has the function of observing and criticizing the self and of exercising a censorship within the mind, and which we become aware of as our ‘conscience’. In the pathological case of delusions of being watched, this mental agency becomes isolated, dissociated from the ego, and discernible to the physician’s eye. The fact that an agency of this kind exists, which is able to treat the rest of the ego like an object - the fact, that is, that man is capable of self-observation - renders it possible to invest the old idea of a ‘double’ with a new meaning and to ascribe a number of things to it - above all, those things which seem to self-criticism to belong to the old surmounted narcissism of earliest times.¹

¹ I believe that when poets complain that two souls dwell in the human breast, and when popular psychologists talk of the splitting of people’s egos, what they are thinking of is this division (in the sphere of ego-psychology) between the critical agency and the rest of the ego, and not the antithesis discovered by psycho-analysis between the ego and what is unconscious and repressed. It is true that the distinction between these two antitheses is to some extent effaced by the circumstance that foremost among the things that are rejected by the criticism of the ego are derivatives of the repressed.