Who sent the brocade book in the clouds, the wild goose returned, and the west wing was full of moons. ("A Prune" Li Qingzhao)
Poor autumn, a curtain darkened the west building. (< Zhang)
At dusk, people woke up and had already left, and it rained all over the sky. (Xu Hun)
The book explains that the West Building is only a symbolic concept, or refers to a boudoir, or a place where people used to meet, or a lonely residence, or a place where people climb high and look at the moon and think far away. Poetry generally refers to the West Building, and often refers to sadness. It is a place to bid farewell to sadness or look at the old country, lover and friends.
However, I feel that orientation refers to the real thing, but it must be western, but it is not the same thing. It should be a general term. According to the traditional house naming principle in China, the West Building should be a small building with the stairs facing east. In ancient literature, the West Building is often associated with the image of the moon, because it is more convenient to see the moon in the west, especially when the moon sinks, that is, the moon in the middle of the night. So is the owner of the West Building. This is because, in the Zhouyi culture, the west is a girl, so the ancients often lived in the west wing according to the principle of geomantic omen, that is, the unity of man and nature. The moon is the image of lovesickness in China literature, so the west wing is mostly related to boudoir thinking, and it is convenient to see the moon in the middle of the night in the west wing, which shows that people who see the moon miss it deeply and can't sleep. The west is in the five elements.
The west building is convenient for watching the moon in the middle of the night, so it is used to write about missing people on a moonlit night or sad things in the middle of the night. Gradually, the West Building has evolved into a synonym for acacia and sadness in ancient poetry, just like the willow branches in ancient poetry represent the feeling of parting.