Steiner's original contribution to human knowledge was based on his ability to conduct spiritual research, the investigation of metaphysical dimensions of existence. With his scientific and philosophical training, he brought a new systematic discipline to the field, allowing for conscious methods and comprehensive results. A natural seer from childhood, he cultivated his spiritual vision to a high degree, enabling him to speak with authority on previously veiled mysteries of life. Topics include: the origins and nature of architecture; the formative influence of architectural forms; the history of architecture in the light of mankind's spiritual evolution; a new architecture as a means of uniting with spiritual forces; art and architecture as manifestations of spiritual realities; metamorphosis in architecture; aspects of a new architecture; the first and second Goetheanums; the architecture of a community in Dornach; the temple is the human being; the restoration of the lost temple.