Among the four gates of the Forbidden City, why is Donghuamen called the gate of hell by the people?

The Forbidden City can also be called the Forbidden City. There are 24 emperors living here. The whole building is solemn and gorgeous, and its structure contains the five elements of Yin and Yang in our country, so the feeling of the Forbidden City is mysterious. There is a gate in the southeast and northwest of the Forbidden City. They are Donghuamen, Wumen, Xihuamen and Shenwumen. They are all the gates of the Forbidden City, which should be the same by rights, but Donghuamen is very mysterious, and the people still call it the gate of hell. What's going on here?

Ancient people were very superstitious. Because of limited technology, the ancients always liked to associate some things with ghosts and gods, and also created some theories to control ghosts and gods. For example, in the theory of yin-yang and five elements, in ancient times, people would regard odd numbers as samples and even numbers as yin, and yin was very unlucky in people's eyes, because yin was always associated with some ghosts.

As the residence of the emperor, the Forbidden City is naturally the most luxurious to build, although the gate of the Forbidden City is not simple. There are some golden doornails on the door of the Forbidden City, which are not randomly arranged. Generally, there are nine rows in the horizontal direction and nine rows in the vertical direction, which add up to 8 1, which is an odd number and represents the polar sun. The three gates of the Forbidden City are all built in this way. Except Donghua Gate, the doornails on it are arranged in eight rows horizontally and nine rows vertically. The doornails add up to 72, which is an even number representing yin. This is very unlucky, so people call Donghuamen the gate of hell.

The ancients thought that the east-west direction of the Forbidden City was wooden soil, but the relationship between soil and gold was not conducive to the inside, that is to say, it was not conducive to the inside of the Forbidden City. Ancient architects deliberately used the principle of mutual development and mutual restriction when building, turning Donghuamen into a yin door, and the yin wood could not restrain the yang soil, which was naturally beneficial to the development of the palace.