What are the architectural features of the Forbidden City?

The Forbidden City covers an area of 720,000 square meters, building area of 150,000 square meters, the existing building more than 980 seats, there are more than 8700 houses, the Forbidden City around around the 10-meter-high walls, outside the more than 50-meter-wide moat. Ming and Qing Dynasty Forbidden City was built in the center of Beijing, to the north and south for the axis, sitting north to south, fully embodies the supremacy of imperial power of the feudal ruling ideology; Forbidden City outside the city is the Imperial City, the Imperial City outside the city of Beijing, the city surrounded by the city, showing a strict hierarchical system. Historically, the Forbidden City has been rebuilt many times due to fire and other reasons, but the basic pattern has not changed, the entire Palace building is divided into the south before the dynasty and the north after the court two parts. The front court has three halls: Taihe, Zhonghe and Baohe, which are the largest buildings in the Forbidden City and where the emperor held major ceremonies. It is a symbol of feudal imperial power. After the court to Qianqing Palace, Jiaotai Hall, Kunning Palace as the center, around the east and west of the six palaces for the wing, is the emperor, the empress, the concubines live in the place. Before and after the court, the boundaries are clear, can not be casually overstepped, reflecting the ancient Chinese traditional hierarchy. The ethical concept of distinction between inside and outside. Chinese architects planned the building in a well-organized manner, using the heavy walls and gates and courtyards to assemble the Forbidden City into a magnificent complex in an orderly manner. The planning and construction of the Forbidden City in the Ming and Qing dynasties not only inherited the tradition of ancient Chinese architecture, but also developed and innovated, which is a masterpiece of ancient Chinese culture and the achievements of ancient Chinese architectural art. The combination of indoor and outdoor architectural space, the matching of building volume and size, the use of materials, the furnishings of vignettes, and the production of decorations. Multi-color selection and use in this royal palace building have reached a high level, resulting in exciting artistic effects.