After Zhang Qian's voyage to the West in the Western Han Dynasty, cultural exchanges between the Central Plains and the Western Regions were frequent.
The pattern of Chang 'an in Tang Dou is very neat.
The calligraphy of Yan Zhenqing, a calligrapher in the Tang Dynasty, is called "Yan Jin", which is as famous as Liu Gongquan's "Liu Gu".
After accepting Yang Guifei, Emperor Xuanzong of the Tang Dynasty coveted beauty and ignored state affairs. One end of corruption in the middle Tang Dynasty.
The literary inquisition prevailed in Qing dynasty, and scholars dared not discuss state affairs indiscriminately.