How to distinguish the early and late stages of Gu Cheng’s poetry? What are its specific expressions?

When Gu Cheng was interviewed by Zhang Suizi in Germany in 1992, he once discussed the issue of pre- and post-stage staging in detail:

“In the beginning, it was the natural ‘I’. This ‘I’ itself There is a kind of childishness, but also dreams, hopes and fears. The poems I wrote during this period were more natural and lyrical, allowing me to speak to the birds, the world and myself. Then there is the 'cultural me' and what I was able to do at that time. The "we" who share the same spirit with me become a whole. In this whole, I am absorbing the nutrients of traditional Chinese culture and Western culture. The poems I wrote during this period have a strong human, psychological, and even emotional value. The color of society. I began to evaluate the world from a human perspective. Then there is the 'counter-cultural me', who uses counter-cultural methods to fight against the dominance of culture on me and the world. During that period, I had a destructive mentality and used absurd language. After that, I found that searching for 'me' and confronting the world were all in a vicious circle. I lost interest in culture and counterculture, and gave up the pursuit of 'me'. , entering a state of 'no self'. I began to write a natural poetry, no longer using text techniques, and no longer expressing myself. I no longer had dreams, no more hopes, no more fears.