That gentleman doesn’t know much about calligraphy:
Cao Zhuan: ①Another name for Fei Bai. Cai Yong of the Eastern Han Dynasty said: "The basis of curo seal script is dark, but the elegance and elegance have not been announced." "Jin Shi Lin Introduction": "One is Fei Bai, the appearance of the seal script is attached to the bone, and a mixture of ancient and modern methods are used to make the cursive seal script and serve as a utensil. What you do is done by yourself, you have to do it. "② Refers to the seal characters written in cursive script. "History of Calligraphy and History" states: "Eunuch Guang (Zhao) devoted himself to the study of Cangshi, created cursive seal scripts, and stamped the "Tianxi Stele" with minor changes. Yao's character has surpassed that, and the book does not touch the remains." Fu Shan and others are good at cursive seal script.
As for your question: Compared with the cursive writing method of seal script, cursive seal script appears naturally in the process of handwriting. This fact can be proved from the bamboo slips and silk books of the Warring States Period. "This kind of seal script, due to practical needs, requires a faster stroke when writing. Many strokes have unconscious strokes at the beginning and end of the strokes due to the speed of strokes. Liu Xizai's "Yi Gai" said: "The Han Dynasty's "Sacrifice to the Three Lords" "Mountain Stele" has the word "repeated" in the lower half with a cursive movement. "This character, let's call it the prototype of Cao Zhuan, or quasi-Cao Zhuan. There is a poem by Cai Yong of the Eastern Han Dynasty: "How can Cao Zhuan's foot be dark, but the elegance of it has not been announced. "But the cursive seal script here may only be mixed with Fei Bai's writing. Cai Yong is the originator of Fei Bai's script, and the seal script written by him is very likely to have the characteristics of Fei Bai's script. Today, we can also learn from the ink marks on bamboo slips and silk scripts before the Eastern Han Dynasty Perhaps the shadow of flying white in the seal script can be seen in the middle. The cursive seal script of this period can also be called "ancient official script", which is the transition from seal script to official script