In the east and the west, the ancients also took the east as the head and the west as the second. Empresses and concubines live in the East Palace and the West Palace. The East Palace is the most important, followed by the West Palace. Ancestral temples dedicated to ancestral tablets should be built on the east side of the palace. The "master" and "landlord" in modern Chinese also come from this. In addition to east, west, north and south, there are also high and low points to indicate the direction. The ancient emperor was supreme. He sits facing south and north, and the east is on his left. Therefore, while advocating the East, the "Left" has also become noble. Wu Dong occupied Jiangdong during the Three Kingdoms period, also known as Jiangzuo.

The source upstairs is correct, but the explanation of the owner's residence is wrong. For the people, the main house is not the east house, but the head of the household lives in the north house, which means sitting north facing south: the east house lives in the elderly.

The quadrangles in Beijing are bungalows with no buildings. The most important room in the yard is the main room. The first room is the north room, also called the upper room or the main room. Because the ancestral tablet and the main hall are located in the middle of the main room, the main room occupies the highest position in the whole house, and its width, depth and height are larger than other rooms. Generally, there are three main rooms, with the ancestral hall in the middle, grandparents living in the second room in the east and parents living in the second room in the west. Moreover, the slightly larger rooms on the left (the second room in the east) and right (the west) of the main room in the old house are the result of the traditional custom "left is the top". In the past, people had the custom of respecting the left. We often say "Zuo Zu Ancient Temple", "Wen Zuo has no right" and "Men left and women right" all show respect for the left.