The last two sentences of the Sangcha Tunnel show a shepherd boy lying under the Liu Yin, sleeping sweetly, while the cow just eats grass and goes further and further until it reaches the west of Liulin. Sangcha Cave is a poem by Yang Wanli, a poet in the Southern Song Dynasty.

This poem describes the scenery of the fields and watersides in the south of the Yangtze River in summer: just after a shower, the weather is warm and cool, the streams are full of flowers, the grass is green and the willows are dense, rendering a bright and warm atmosphere. At the same time, it depicts the dynamic picture of children herding cattle and creating an infinite artistic conception. The whole poem has a freehand vision, a wide range of colors, close-ups, detailed outlines and nuances, and the whole poem is full of classical silence and purity.