For example, in Cao Cao's poems, Jieshi is in the east to see the sea, water, mountains and islands.
It's all four-word correspondence
When it came to Tao Yuanming, there were five-character quatrains. For example, building a house is under the condition of people, and there are no horses and chariots. If you ask him what he can do, he will be biased from a distance. Such poems are more catchy to read and easier to recite.
It gradually developed into the Sui Dynasty and evolved into the rhythm of five-character quatrains, and the four-character correspondence was gradually abandoned. This is related to the development of the times.