According to the book of the Great Qing Dynasty, there were 308 VATS in the Forbidden City. As a result of historical changes, there are now about 200 sculptures with a height of 80. The price of the other sculptures is mostly unknown.
The big VAT in the Forbidden City is also called "Menhai". According to the quality, it can be divided into three types: Copper gilded auspicious cylinder, "burn ancient" Bronze Cylinder and iron casting large cylinder. The first type is copper gilded auspicious VAT, which is quite valuable. In front of the gate of Taihe palace in the Forbidden City, there is a large gilded bronze VAT, each with a height of 1.2 meters and a diameter of 1.63 meters. The upper surface of the VAT is engraved with the word "made in Qianlong period of the Qing Dynasty". The two sides of the vat are decorated with animal face patterns to pave the first ring ears. The second type is "burn ancient" bronze jars, all made in the Qing Dynasty. The large copper jars are made by manufacturers. They have bright and elegant ink on the surface. There are two such large jars in front of Jingyun gate and longzong gate. The third type is the large iron cylinder made in Ming Dynasty, which is simple and elegant.
All the buildings in the Forbidden City are of brick and wood structure, which is easy to catch fire. In case of a fire, if the fire cannot be put out in time, the fire will spread rapidly, which will turn this splendid building into nothing. For this reason, the builders of the Forbidden City pay special attention to fire prevention, and set up these "gate sea" in front of the palace.