The decoration and design of doors and windows was a fixture in classical Chinese architecture. Doors and windows were symbolic curtains separating heaven and earth in traditional Chinese architecture. Opening these curtains created an all-important harmonious link between heaven and earth. The apex of classical Chinese architecture was in the Qin (221-206 B.C.) and Han periods (206 B.C.-220 A.D.), the Tang (618-906 A.D.) and Song periods (960-1127 A.D.) as well as the Ming (1368-1644 A.D.) and Qing periods (1644-1911 A.D.). With its precisely printed illustrations and concise texts in English and Chinese, this large format, extremely elegantly finished book gives the reader an opportunity to study the major creations of these periods.