Although the stone pillars of the Forbidden City look roughly the same as those of other palaces, there is nothing special about them, except that they often have holes in the sky. As one of the most famous scenic spots in the existing history, the Forbidden City is also the oldest museum in China. Every place in the Forbidden City is worth exploring and studying by historians now. Due to the huge collection and distinctive architectural features, the bricks and tiles of the Forbidden City reveal the painstaking efforts and condensed wisdom of the ancients in the construction process. Therefore, although in the past many years, the Forbidden City has attracted domestic and foreign tourists and brought people extraordinary experiences because of its large scale, long history and unique architectural style.

Of course, the most prominent of these advantages of the Forbidden City is its architecture. Take the most humble stone pillar as an example. General stone pillars are mostly used to reinforce the foundation, which supports the house and increases the use area of the lower floor. However, the stone pillars of the Forbidden City are not simple. The stone pillars of the Forbidden City are high and low. The tall ones are used to support houses, and the short ones are used to decorate the surroundings. For example, there are many rows of stone pillars on both sides of the aisle, but if you look closely, you will find that these stone pillars look different.

Let's take the pattern as an example. Some stone pillars have a shower head at the top, while others have a conical top with some patterns carved on it. But these stone pillars are different in design and construction technology. Strangely, some stone pillars are solid while others are hollow. The reason is that with this special structure, the sound can be transmitted through the front stone pillar, so that the whole people in the Forbidden City can hear the noise and get the news as quickly as possible.

This idea is very clever. The Forbidden City has a huge area, so it is really difficult to transmit information. If you want to convey the danger signal in a short time, you must notify people one by one and delay the news. In this way, you can quickly and conveniently convey them to people in various palaces and let them know the changes in the palaces in time.