The dense round nails on the gate of the Forbidden City in Beijing are used to prevent fire and theft, and also to reinforce the door panels. At that time, a gate was only reinforced by a few boards, so round nails were nailed to stabilize the boards. At first, round nails were not what we see now. The first round nail was actually made of wood, then it was changed to iron and finally to copper. The main reason is that copper can also play a role in fire prevention.

During the Ming and Qing dynasties, many rich people also used this kind of nail. This kind of nail can not only prevent fire and strengthen the door panel, but also be a symbol of power and wealth. With this round nail, it can not only play a decorative role, but also make the door look stronger. The nails nailed on the gate of the Forbidden City were not randomly ordered. Every nail here is also very particular. How many nails are used in each row and vertical?

How many nails can reflect a person's status, and it also means the supremacy of imperial power. The nails in front of the emperor's door are different from those nailed by other palaces and courtiers. The number and arrangement of nails are different in different positions and grades. In ancient times, only dignitaries could nail this kind of nail, while ordinary people could not use nails at all. In ancient times, it was also a symbol of nobility.

I visited the Forbidden City with my own eyes. But at that time, I didn't carefully observe how many nails were in front of the Forbidden City. I didn't touch this nail that symbolizes authority. It's really a pity to think about it now.