Carl Jung believed that the psyche is made up of three levels: the conscious, personal unconscious, and collective unconscious. The conscious plays a minor role, while the personal unconscious contains repressed memories and the collective unconscious is inherited from ancestors. Jung proposed that archetypes like the persona, shadow, anima/animus exist in the collective unconscious and can be revealed through dreams, fantasies, and active imagination. He described personality types based on the attitudes of extraversion/introversion and the functions of thinking/feeling and sensing/intuiting. Jung believed individuals progress through life stages towards self-realization by integrating opposites within themselves.