The book "The Psychology of the Subconscious. A Study of the Transformations and Symbolism of the Libido. A Contribution to the History of the Evolution of Thought" by Carl Gustav Jung reveals the deep aspects of the human psyche and the relationship between the conscious and the subconscious. Jung analyzes the symbolic representations that arise in the human psyche and reveals the connection between them and the inner unconscious desire. The book examines the role of libido in the formation of mental conflicts and transformations that occur at different levels of the psyche. It is an important and profound study that helps to better understand human nature and its complexities.