Taking pictures all over the railing is the allusion cited by Xin Qiji's "Hidden Water Dragon": In Talking about Swallows, Wang Bizhi, a Song Dynasty poet, recorded that Liu Mengjie, who was "at odds with the world", often stood still by the railing, thinking about the world, sighing alone, or patting the railing with his hand. There is a poem that says, "I miss reading for forty years, get drunk several times, and pat the railing." Therefore, patting the railing all over often means patting the railing to vent unspeakable depression.
The author thinks that the most suitable topic for creating the statue of Xin Qiji is to shoot the railing all over. In the deafening sound of the poet patting the railing, we can read Xin Qiji's real complex feelings: dissatisfaction, resentment, anxiety, chagrin, impatience and waiting.