They evidently live and function in the deeper layers of the unconscious, especially in that phylogenetic substratum which I have called the collective unconscious. This localization explains a good deal of their strangeness: they bring into our ephemeral consciousness an unknown psychic life belonging to a remote past. It is the mind of our unknown ancestors, their way of thinking and feeling, their way of experiencing life and the world, gods and men. The existence of these archaic strata is presumably the source of man's belief in reincarnations and in memories of "previous experiences". Just as the human body is a museum, so to speak, of its phylogenetic history, so too is the psyche.