" The picture we are left with is that of a psyche divided into three layers: the bottom, primordial layer is the collective unconscious, which consists of psychoid contents that can never reach ego-consciousness (although they can still impinge on ego-consciousness and thereby cause introspectively accessible effects, such as dreams and visions). The middle layer, sandwiched between the other two, is the personal unconscious. The top layer, which we ordinarily identify with, is ego-consciousness. Psychic contents can move between the personal unconscious and ego-consciousness. "

― Bernardo Kastrup , Decoding Jung's Metaphysics: The Archetypal Semantics of an Experiential Universe