What are the ten-sided stone drums discovered in the Tang Dynasty for?

Stone drums are 10 granite stone piers in the shape of steamed bread made in Qin dynasty. A four-character poem is engraved on the surface of each drum. The word on the drum is called "Shi Guwen", which is also called "hunting" because the poem is a narrative of Qin's wild hunting. "Shi Guwen" is a transitional character between the inscriptions on bronze and Xiao Zhuan, also known as "Shu Shu", which is the earliest existing stone inscription in China. The Three Ugly Courtyards of Tianxing (now Baoji, Shaanxi) were unearthed in the early Tang Dynasty. When it was unearthed in Shi Guwen, after thousands of years of wind and rain, it was burned by wildfire and covered with moss. Some words are mottled and fall off, and half of the 465 words are illegible. Tang Dynasty calligraphers Yu Shinan, Ou Yangxun and Chu Suiliang all copied rubbings. In the first year of Yuanhe in Tang Xianzong (AD 806), Han Yu, then a doctor of Guo Zixue, suggested to imperial academy that Qin Shigu should be moved to imperial academy to be protected as a lecturer, but imperial academy refused at that time. It was not until the ninth year of Yuanhe (AD 8 14) that Zheng Yuqing had the stone drum moved to Fengxiang Confucius Temple. At this time, the stone drum had been lost. After the war, the stone drum was moved out of the Confucius Temple and disappeared. In the early years of the Northern Song Dynasty, Sima Chi, the magistrate of Fengxiang County, discovered the lost nine-faced stone drum and put it under the door of Fengxiang official school. In the fourth year of Song Renzong's reign (A.D. 1052), the project was to find a stone drum rubbings named "Zuo Yuan", and finally found the lost stone drum in a small village in Qinling Mountains. During the Daguan period, Evonne, the emperor of Hui Zong, ordered the ten-faced stone drum to be moved to Bianjing, and ordered the goldsmith to fill the inscription on the stone drum with gold and move it to the Baohe Hall for collection. During the "Jingkang Revolution", the ten-sided stone drum and other precious cultural relics were moved to Yanjing by Jin Jun, during which the stone drum was seriously damaged. During Yuan Dade's reign, Yu Ji, a professor of Guo Zi studies, found an abandoned ten-sided stone drum in muddy grass, moved it to the stone altar of Dachengmen in Guozi studies, and set up an iron fence for protection. At this point, there are only 386 words left on the drum. The Ten-sided Stone Drum is now in the Palace Museum in Beijing, and there are only 365,438+00 words left in Shi Guwen. Shi Guwen's calligraphy style belongs to the seal script system, also known as seal script, which is the earliest stone carving found at present. It further standardizes the Chinese font style and makes its layout more elegant, dignified, natural, simple and symmetrical. Shi Guwen attaches great importance to the three-dimensional effect of the text structure and the sense of brushwork of lines, and the text is tied up and down, strewn at random, strewn at random. The brushwork is rigorous, vigorous, round and dignified, which is the first of its kind. These ten faces seem to be round drums from outer space, and there are still many unsolved mysteries about their characters and shapes. Shi Guwen's calligraphy art provides rich content and broad development space for later generations' calligraphy creation.