What is "six and a half books"?

Six and a half books means: Banqiao style, a calligraphy font written by Zheng Banqiao. He used official script to refer to running script, which was neither formal nor modern. The overall feeling is patchwork and unique, which is based on his profound understanding of traditional calligraphy.

Zheng Xie's poetry and calligraphy are excellent, which was called "Three Musts" at that time. His calligraphy art is unique in the history of calligraphy and painting in China. His calligraphy is unique, giving people the impression of paving stones, which is called "Banqiao Style". He nicknamed it "Six and a Half Books". In fact, it is to integrate official script into running script, and at the same time write in cursive script.