What images does Du Fu have when he appreciates climbing Yueyang Tower?

This five-character poem was written one year before the poet's death, that is, the third year of Tang Daizong Dali (768). At that time, Du Fu drifted from Jiangling and Gongan to Yuezhou (now Hunan). Boarding the long-awaited Yueyang Tower, overlooking from the porch, facing the vast and magnificent Dongting Lake, the poet sincerely admired; Then I thought that I was wandering in my later years, and the country was full of disasters. I couldn't help feeling a lot, so I wrote this famous article with lofty mind and great pain. Yueyang Tower is the west gate of Yueyang City, Hunan Province, and one of the three famous buildings in China (the other two are Yellow Crane Tower in Wuhan and Wangtengting Pavilion in Nanchang), from which you can overlook Dongting Lake. In the fourth year of Tang Kaiyuan, Zhang Shuo, secretary of the Secretariat of the Central Committee, worked in this state and often went to the building with talented people to compose poems, which made it famous and became a world-famous cultural building. This poem is the masterpiece of the five laws in Du Fu's poems, and it was called the first of the five laws in the prosperous Tang Dynasty. On the whole, the grandeur of mountains and rivers and the breadth of the poet's mind are both inside and outside the poem. Although sad, but not depressed; Although depressed, but not depressed. In the Song Dynasty, Hu Zai's Tiaoxi Fishing in Conghua quoted Cai Taiwa's Xiqing Poetry as saying: "Dongting is a grand view, and there are many people who wrote it in the past dynasties ... However, if Meng Haoran's" a cloud rises from a dream valley and has been besieging Yueyang City "is not true, the Dongting is vast and the weather is magnificent, just like in front of him. It is impossible to read Du Zimei's poems. There is Wu in the east and Chu in the south, and you can see the endless drifting of heaven and earth.' Shaoling has swallowed many clouds and dreams in his chest. "The whole poem is pure fu, and it is a narrative style from beginning to end. In the past, some scholars thought that poetry used fu method, which had no image and poetic flavor. In fact, Fu is an important way to visualize poetry, which is characterized by not paying attention to the language of poetry and the visualization of local things, but paying attention to creating the overall artistic conception of poetry. " "The Story of Climbing Yueyang Tower" is a model of shaping artistic image by using fu method. The artistic realm it has reached has made people feel that there is no artistic method or even language, but the poet's thoughts and feelings directly hit the soul.