Bird book: (birds and insects? Script) is also called "worm book" and "bird insect seal". It belongs to a special artistic font in Jinwen. It is a special script that prevailed in southern countries such as Wu, Yue, Chu, Cai, Xu and Song from the middle and late Spring and Autumn Period to the Warring States Period. This kind of calligraphy often appears in the form of wrong gold, which is noble and gorgeous, rich in decorative effect, unpredictable and difficult to identify.
A variation of calligraphy is not strictly calligraphy, but it is beautiful and can be considered as ancient calligraphy!