From what angle do the first and second sentences of Li Shangyin's "Kung Fu" describe the scenery?

Name: "Wu Gong" Year: Late Tang Author: Li Shangyin Genre: Seven-character quatrains The threshold of the dragon gate is heavy, the water is clear, and the forbidden door hides the human voice deeply. The prince of Wu gave a banquet in the palace and went out for the night. The title is Wu Gong, but the things described in the poem are not necessarily directly related to the life of Fu Cha and Wu Gong, the king of Wu in history. Poets only reflect reality in the name of praising history. Generally speaking, no matter whether the time background is day or night, whether the layout of the pen is simple or simple, the dissolute life is always described in a positive way to varying degrees. But this poem does not describe the luxurious life of martial arts from beginning to end, but simply writes it from the side. The first two sentences were written at dusk, and a dead silence enveloped the whole martial arts palace. Dragon sill refers to the pavilions and pavilions near the water in the palace, with railings; The water temple is a palace built by or in the water. Dragon sill and water hall are usually the most lively and noisy places in the palace, but now no one is seen, only the outline and shadow of the building are looming in the dusk. "Qing" calligraphy and painting reflects the scene of the water temple on the still water surface, suggesting that the water temple is air-cooled. If the first sentence mainly describes the ethereal spirit of Wugong from the visual experience, then the second sentence mainly describes its calmness from the auditory experience. At dusk on weekdays, it is the moment when the palace is brightly lit, the songs and flutes chase each other and the dance music falls. At this moment, the door of the palace is closed and silent, just like an empty temple that is uninhabited. This is a dead silence, which causes readers to explore the inside story and seek answers. The description of the third sentence above makes readers understand at once that the death of the Wu Palace at dusk turned out to be the result of "drunken banquet". Once awakened, the silent scene described in the first two sentences will in turn guide readers to fully imagine the noisy singing, carnival and ecstasy in the palace before that. Moreover, the more prominent the dead silence described in the first two sentences, the more unrestricted the reader's imagination of the crazy pleasure scene. The word "drunk" is very heavy with a pen It not only shows the fact that the banquet is full of drunkenness, but more importantly, it reveals a crazy and decadent desire for pleasure, a mental state of being drunk and dreaming. It is here that the poet wrote a meaningful ending. "Shui Piao spends the evening out of town". This seems to be a very common detail: at dusk, the Wu Palace is deserted, and only the running water in the imperial ditch flows slowly in the darkness, drifting petals and flowers out of Miyagi. Such a detail, if viewed in isolation, may not have much practical significance; However, it is very rich and chewy to describe it in the background of "Wu Wang's night banquet is full of drunkenness". For a gorgeous Miyagi, people usually first notice its magnificent architecture and brilliant colors; Even at dusk, the first thing you notice is the scene where bright lights compete with silk pipes. Only when there is a dead silence in the martial arts palace and dusk covers the dark Miyagi, will you notice the imperial ditch flowing quietly under your feet and the falling flowers floating on the water. If we say that one or two sentences about the death of Wu Palace at dusk are still relatively general, focusing on external description.