The building theory classes at the Bauhaus focused on imparting a functional understanding of architecture. Building had become a science. As a result, the ADGB Trade Union School was designed logically from the inside out, with the requirements of the residents and dictates of the natural environment determining the form arising from the environmental and materials studies. Walter Peterhans’ photographs of the school images illustrate both the architect’s intentions for the building and the environmental studies conducted by Bauhaus students.