Since you mentioned the theory of Yin and Yang, you should first understand that Tai Chi gives birth to two instruments, two instruments give birth to four images, and four images give birth to gossip. ......
In geomantic omen, formalism follows the laws of nature and is the simplest geomantic omen. After Guo Pu invented Feng Shui, Yang Gong inherited it. .....
What you said about why there are no White Tiger Gate and Qinglong Gate is incorrect.
Generally, there are four doors in ancient palaces, city gates and imperial tombs.
As for why there is a lack of green dragons and white tigers, this is also wrong.
In fact, the most important thing in Feng Shui is sitting, and sitting is the most important thing. The second is the so-called left and right, and the second is gossip. Looking at the form of Feng Shui is actually looking at the four elephants. But the application should be judged according to the gossip house.
The layout of Chang 'an is a typical representative of formalism, which embodies the concept of the integration of heaven and earth and emphasizes the concept of one thing and one Tai Chi.
In fact, you can't see Feng Shui, so you think there is no White Tiger Gate, which is your misunderstanding.
But emphasizing sitting, that is, Xuanwu Zhuque Gate, is the "root" of Yin and Yang.