An exploration of the cosmic origins of humans and the evolutionary laws governing their development. Armin Husemann uses musical principles as a method to gain awareness of the structure of the human body and the forces acting upon it. He examines our experience of music and explains the physiological and anatomical relationships in the body, as well as illuminating the spiritual influences that determine physical development. Following Rudolf Steiner's artistic exercises for a better understanding of these influences, the book explores the cosmic origins of humans and the evolutionary laws that govern their development.