"AION. A study of the phenomenology of the self" is the fundamental work of the famous Swiss psychiatrist and psychoanalyst Carl Gustav Jung. In this book, the author presents his thoughts on psychology and religion, analyzes the concepts of the self and the collective unconscious. Carl Gustav Jung in AION illuminates complex aspects of the self and explores them from the perspective of archetypes, symbolism, and mythology. The author considers the self process as a manifestation of higher mental forces that influence a person's life and his perception of the world. This book is an important source for understanding the deep psyche of a person, as well as for studying the archetypes that influence his behavior and destiny. AION offers the reader the opportunity to delve into the world of analytical psychology and discover new ways for self-development and self-discovery.