The ability to perceive internal and external reality and to know the meaning of what one perceives requires a free imagination. But imagination is never completely free of interference.

Since imagination, along with perception and judgment, is a private mental experience, whatever interferes with it must arise most immediately from the internal world.1 This inhibiting force has the power to control the mind and to sti¯e perception, imagination and judgment. When these faculties become too free ± that is, when they cross certain boundaries ± there is a part of the mind that strikes terror into one's heart. This part of the mind is the archaic superego.