How does Ai Qing use acousto-optic color to create poetic images, what is the main theme and how to express it?

In the poems of "North" and "Yuan Ye", Ai Qing uses symbolic and suggestive techniques to play a melancholy tone full of pity, and at the same time uses the gloomy color of the yellow land to give people a sad and gloomy hint and infection. This is probably the beauty of personality formed by Ai Qing's aesthetic exploration of new poetry: he is not only good at using realistic methods to form realistic images, but also fully expresses his unique feelings about life, achieving the perfect unity and even integration of external objective images and internal rational world; He is also good at using romanticism or symbolism to form a typical imaginative writing image to entrust or conceal the poet's yearning for life and the future. From the artistic conception presented in his poems, we read an old China, a contradictory blend of reality and ideal, and a rich rhyme of suffering and hope.

Street performers, beggars, mending women, wheelbarrows, sad north, misty wilderness and barren fields ... The images of suffering he wrote infiltrated into deep, grayish yellow and gloomy cold colors, causing suggestibility and bringing readers a gloomy and depressed feeling, which fully showed the tragic beauty and gloomy beauty of a beautiful thing being destroyed. This is the condensation of Ai Qing's patriotic feelings and feelings for the people.

Ai Qing is a conscious pursuer of symbolic images. He wrote a lot of imagery poems. Through a lot of research, we can find that the symbolic images in Ai Qing's poems can be divided into figurative symbolic images and extended symbolic images, among which figurative symbolic images include public figurative symbolic images and private figurative symbolic images. The extended symbolic image has the characteristics of self-comparison, implication and philosophy.