What is Qian Zhongshu's "Pipe Knocking"? How to read?

Theoretically, if you want to read the annotation of Guan Cone, you must read the original work first. The theoretical system of Zhouyi is huge, and the proper nouns are obscure, just like quantum mechanics now. Zuo Zhuan, on the other hand, seems straightforward, but in fact it is like China Party History. These two books are not allowed to be introduced unless they are guided by famous teachers; The Book of Songs can be read, but please be careful when reading Shi Mao. If you can't sleep after watching the news broadcast, I'm afraid you will have the same reaction when watching Shi Mao. Having said that, I actually recommend you to look at the historical records of Guanzubian.