What is the difference between Cao Pi's "four families and eight bodies" and Lu Ji's "ten bodies"

Cao Pi put forward the stylistic theory of "four subjects and eight styles": "The recitation should be elegant, the book should be rational, the topic should be realistic and the poem should be beautiful." He proposed that "four subjects" have eight genres of articles. And think that different styles have different styles. This is the earliest detailed stylistic theory and the earliest stylistic theory of different styles. It marks a new stage in the study of stylistic classification and characteristics. Especially "Poetry and Fu Desire for Beauty" shows that he saw the aesthetic characteristics of literature as art, which has a particularly far-reaching impact on the development of lyric literature. Cao Pi's Dian Lun Thesis shows that the literature of Wei and Jin Dynasties is gradually moving towards the era of consciousness.

In "Wen Fu", Lu Ji divided the genre of the article into ten categories, and specifically summarized their style characteristics: "Poetry is beautiful because of emotion and clear because of style. The inscription is sentimental and sad. Mingbo is warm and moist, and he is strong in the face of frustration. Praise the excellent tour to be beautiful, exquisite and fluent. Play with a flat car and talk about it. " The ten-style theory he put forward here is more detailed than Cao Pi's four subjects and eight styles, and points out that these ten-style articles have different styles. In particular, he put forward the theory of "poetry is beautiful because of emotion", which only talks about poetry "because of emotion" without expressing ambition, which actually plays a great role in freeing poetry from the bondage of "etiquette and righteousness". This, together with "vivid expression", emphasizes two important characteristics of this literary work: emotion and image. It reflects that his understanding of the characteristics of literature and art has greatly deepened.