Yueyang Tower has two sections, one is cloudy, the other is sunny, and the other is sad and happy. Please tell me what caused the "stair climber"

The second paragraph describes not the Yueyang Tower itself, but the transition from the grand view of Yueyang Tower to the artistic conception of viewing things.

The content of this passage is about scenery, and the tone is about discussion. As soon as I came up, I put forward my own view: the beautiful scenery of Baling is concentrated on Dongting Lake, which is a distant mountain, engulfing the Yangtze River, surging and endless. These words describe the vastness of lakes and the vastness of water potential in space. The next two sentences, "sunny in the morning and cloudy at night", show the changes of Dongting Lake from different scenery at different times. In the early morning, the sun shines brightly, making Dongting Lake look like a mirror, just as Zhang Bi, a poet in the Tang Dynasty, said in his poem, "Endless is paved with glass". At night, the fog is low, and Dongting Lake is shrouded in darkness, just as Li Qi, a poet of the Song Dynasty, wrote: "Fog and rain sink clouds and dreams, and smoke and waves are misty." The above sentence captures the different scenery of Dongting Lake in different periods, vividly renders its myriad weather, and then concludes: "This is the grand view of Yueyang Tower, which was prepared by predecessors." Since the previous description is complete and there are poems engraved on Yueyang Tower, Fan Zhongyan won't go into details. People know me slightly, and people know me slightly, so they write about the feeling of going upstairs to see things: "But the northern martial arts, the Antarctic Xiaoxiang, and the poets who moved away from home will all be here. Isn't it strange to see things?" Relocation refers to officials who have been demoted to other places. Qu Yuan once wrote Li Sao, so later generations also called poets poets. Because Dongting Lake is connected to Wuxia in Hubei and Xiaoxiang in the south, Yueyang Tower by the lake is a place where immigrants and poets often gather. Can they feel different when they go upstairs to see the scenery of Dongting Lake? These sentences are the hub of the full text, which naturally leads to the following two paragraphs. The above description of Dongting Lake is objective, and the following are the subjective feelings of imaginative emigrant poets when they view Dongting Lake; The words above are simple, and the words below are eloquent and incisive.

The third paragraph, people who are sad when writing things.

The general idea of this paragraph is: if it is rainy season, it will not clear up for several months in a row; The evil wind roared in the sky, and the turbid waves on the lake vacated; The sun, the moon and the stars cover their brilliance, and the mountains also cover their bodies; Business travelers are afraid to travel, and all ships are damaged; When everything is shrouded in darkness at dusk, only the sound of tigers whistling and apes crying keeps coming into our ears. At this time, when I boarded Yueyang Tower, I felt sad and sad, and I felt even more sad to leave the capital and miss my hometown. I am very worried, afraid of the slander and ridicule of the villain, and I am extremely sad.

The fourth paragraph is happy to write things.

On a mild day in spring, the bright sunshine shines on the calm lake without a ripple. The sky is lined with lake light, which reflects the sky and is green from top to bottom. Sha Ou in the sky flew and stopped, and the fish in the water swam around. The flowers and plants on the shore exude a strong fragrance, which is refreshing. At night, you can also see the smoke on the lake swept away, and the bright moonlight shines thousands of miles; The moonlight is rippling with water waves and shining with golden light. The reflection of the moon is immersed in the water, just like a piece of jade. The fisherman's song duet is full of infinite joy. When you board Yueyang Tower, you will feel relaxed and forget all the honors and disgraces. Raise a glass and drink, laugh at the breeze, and you will only feel extremely gratified and happy.