Chyi Chin's calligraphy and painting refers to four kinds of ancient artistic relics or skills, such as harps, weiqi and colors of calligraphy and painting, which are also called elegant people and four excellent products. In ancient times, playing the piano (mostly refers to playing the guqin), playing chess (mostly refers to Go and China Chess), calligraphy and painting were the skills that literati (including some aristocratic families) had to master to cultivate their self-cultivation, so they were collectively called piano, chess, calligraphy and painting, that is, "four friends of literati". Nowadays, it often expresses personal cultural accomplishment. Among them, "book" refers to calligraphy. Oracle Bone Inscriptions and Jin Wen existed in the early Chinese civilization. In the pre-Qin period, it was mainly carved on bamboo slips with a knife, with characters such as seal script and lower case. After the Han Dynasty, brush writing was the main writing style, including official script, regular script, running script, cursive script, song style and other writing forms.