While on the one hand instant cleanser encounter groups have been proliferating in this day and age, paradoxically there has been a renascence of interest in Jung's far more probing and protracted system of exploration of what Dr. Singer, disciple and practitioner, calls the ""indefinite extensities"" of the psyche. She rarely uses a phrase like this which is so ineffably Jungian -- Jung was particularly concerned with the muzzy terrain which extends between science and mysticism, and between the individual and the collective. She has also tried to write a ""clear, simple"" book about the components of his analytic system, making it more demonstrable with an extensive use of case histories. Thus she explains at rather considerable length the relationship between analysis and analyst (the latter more active than in other schools of depth therapy and catalytic in releasing materials from the unconscious); the complexes -- Jung's original contribution to analysis (throughout she points out his correlations with or divergences from Freud); the archetypes or ""pattern forming elements of the psyche""; individuation and the self; the overall typology; the persona and shadow, the anima and animus (in the conjunction of male-female opposites, vive le difference is still paramount); and the use of dreams and other conduits to the unconscious. A substantial (twelve years in the writing), positive, heuristic overview of this most subjective analytic process to which many young people now are particularly attuned (as recently verified in the Times Sunday Magazine section) although for many it still will remain a reconnaissance of somewhat limited access.