What images did Huang Yun Bodhisattva mainly choose for Shangque in Three Thousand Li of Zisai?

On this day, he drank the autumn scenery of the Great Wall and watched with eyes wide open. He wrote that the purple plug is three thousand miles, and the female wall crow is the west of Wu. This sentence, the momentum of the whole word was provoked, the lines stood upright, the wings were in vain, and the situation was vertical and horizontal. Huang Yun, clouds in traffic jam. In the desert area outside the Great Wall, yellow sand flies all the year round, and the sky seems to be blown into light yellow. The ancients said that the cloud was too yellow. In the Southern Dynasties, there was a saying in Jian Wendi The Journey to the West, "Take a shower to wash the soldiers and send them out to Huang Yun", Du Fu had a saying, "Huang Yunhe is afraid of fans when he returns", Li Baiyou wrote Purple Horse, and he also wrote "Snow White closes the Quyuan, and Huang Shoufan". Zisai, according to Cui Bao's Notes on Ancient and Modern Times: "Qin built the Great Wall, which is purple in color, so it is called Zisai Yan." A female wall is a low wall with concave and convex shapes on the wall.