ego-consciousness — the ‘little light’ — and the realm of the unconscious appear to have a similar basic quaternary structure and to possess a mirror-symmetrical relationship of mutual projection to one another.
Von Franz establishes mutual projection as the structural relationship between ego-consciousness and the unconscious, rooting the concept in Jung’s notion of archaic identity and the involuntary transposition of unconscious contents onto outer objects.
, C.G. Jung: His Myth in Our Time, 1975thesis