Why?
Calligraphy art is inherited, and there are many ways to write a word, all of which must have a source and basis. In the evolution of Chinese characters, seal script is the foundation. Only by understanding the origin of Chinese characters can we truly understand ancient famous posts. Official script evolved from seal script. Seal script and official script were much earlier than grass, righteousness and line, and eventually formed regular script and running script. Prints are then produced in the actual process. For example, the Song Dynasty was created by Qin Gui, but because of its notoriety, later generations named it the Song Dynasty.
In fact, learning calligraphy is also a process of learning the history of calligraphy. Anyone who can be called a calligrapher should be a calligrapher first.