"Nothing is inside, nothing is outside; for what is inside is outside." (Goethe) Yet, the unity of body and soul exists! Moreover, the body, psyche, and environment are in constant interaction. The causality model of cause and effect has long since become outdated. The desire for a holistic view and treatment, in which humans are understood as a unity of body, mind, and soul, is continually increasing in our society. Especially in the fields of health, psychology, and social work, psycho-physiognomy can be used as a complementary tool to recognize the essentials at a glance. Olaf Esseiva describes the nature of these interactions and presents modern scientific theories that are based on the foundational model known in psycho-physiognomy for over 100 years. This book focuses on understanding needs.