Volume One of Series 'Text on Architecture and Art': The intent of the series Texts on Architecture and Art is to make important Texts on Architecture and art originally published in other languages available to an English-speaking readership. Each volume consists of a first-time English translation of a text on architecture or art. The series is dedicated to the understanding of theoretical problems of architecture and art. Edited and with an Epilogue by Markus Breitschmid. Translated by Harry Francis Mallgrave and Markus Breitschmid