Why do calligraphy, poetry and architecture in the Tang Dynasty tend to follow the rules and attach importance to norms?

First of all, the Tang Dynasty experienced the unification from troubled times to the Sui Dynasty, and politically it needed to rebuild social order and maintain the stability of the superstructure. Economically, the highly developed farming civilization in the Tang Dynasty also put forward objective requirements for social stability. Culturally, it is more infected by a prosperous weather; Internationally, as a great power in China, Tang made great efforts to create a great power bearing of all nations coming to Korea. These are reflected in poetry, which is the perfect combination of rhythm and ritual and music civilization, resulting in Tang poetry that pays attention to rhythm opposition; In calligraphy, it is Tang Kai who pays attention to statutes, is square and dignified, and shows grace and generosity; Architecturally, it is to inherit the previous dynasty and plan more rigorous and scientific urban construction and palace construction.