Moreover, I think from Du Mu's poems, we can see what kind of person Du Mu is. Even though there are setbacks and troubles in his life, on the whole, he is very positive.
Du Fu saw what he saw, heard what he heard, and wrote positive and optimistic poems. Because red and green can have a strong contrast in color, they are used many times in poetry, which makes the pictures depicted in his poems more vivid and interesting than others.
Moreover, it is easy to use red and green, which will make the poem vulgar, while Du Mu does not, but it is extremely gorgeous, which makes the picture of the poem very rich and interesting, and it seems that we can deeply understand the kind of emotion inside.
You can find that he likes red and green very much in many poems. For example, "stop and sit in the maple forest late, the frost leaves are red in February", which shows that Du Mu thinks red is super beautiful. "Qian Shan is green, and a stream of cold water is shallow and deep." At this time, animals also think green is great. "Thousands of miles of warblers sing green and reflect red, and the water village is full of wine flags", which feels better with it.
We can see that he is positive all his life, and his life is also red and green. No matter what happens, he is also positive and optimistic. The color complements his personality.
In fact, everyone's poems are in line with his personality, so Du Mu uses so many colors, and red and green are more popular. It can also be seen that Du Mu is a positive person.