What does "synaesthesia" mean in poetry appreciation?

The so-called "synaesthesia" means that "one feeling transcends its own limitations and realizes the impression of another feeling" (Qian Zhongshu's words). From the perspective of reception aesthetics, it refers to the exchange of sensory organs. That is, various senses (hearing, sight, smell, taste, touch, etc.). ) are interlinked. A sense is used to describe B sense. This rhetorical device is called synaesthesia. It often uses the language of images to convey feelings, and by virtue of the mutual connection and reflection of feelings, it stimulates readers to associate and appreciate the aftertaste, thus rendering and deepening the artistic conception of poetry. Please see: 1. "The breeze blows, bringing fragrance again and again, as if it were a faint song on a distant building." (Zhu Ziqing's Moonlight on the Lotus Pond) Here, the sense of smell is transplanted to the sense of hearing, "repeated fragrance" and "faint singing", although the former is described from the perspective of smell, the latter is rubbed from the perspective of hearing. But the two are similar in many aspects, such as intermittent, if there is nothing, light and ethereal, refreshing and so on. Therefore, through association and imagination, the author uses the faint, quiet and elegant songs of distant tall buildings to express the presence or absence of lotus fragrance, which not only reveals the essential characteristics of things, but also creates a beautiful artistic conception. Another example: 2. "The moonlight in the pond is uneven, but the light and shadow have a harmonious melody, such as a famous song played on the Van Aling." (Zhu Ziqing's Moonlight on the Lotus Pond) This is the transplantation of vision to hearing. The brilliance and shadow of the moon and the hazy dance set each other off. The melodies of "famous songs" played by violins are used to describe their harmonious sounds, showing the harmony of combining moonlight with trees and shadows, giving people a melodious, beautiful and close-to-body feeling, and at the same time setting off a warm and elegant atmosphere and bringing readers to. Some people think that "synaesthesia" is a "special metaphor", but it is not. The difference between "synaesthesia" and "metaphor" is: synaesthesia, that is, the transfer of feeling; Metaphor is metaphor. That is, concrete things are better than abstract things, familiar things are better than unfamiliar things, and simple truth is better than profound truth. Its rhetorical effect: easy to understand or vivid. For example, Zhu Ziqing used three metaphors to describe the quiet beauty of lotus flowers in the lotus pond under the moon, such as "like pearls", "like a star in the sky" and "like a beauty who just came out of the bath". "A Pearl" and "A Star in the Blue Sky" are written about the moonlight shining on the dew on the lotus leaf of the lotus pond. The "beautiful woman who just came out of the shower" gives people imagination. If the open lotus girl's face is turned around, then the lotus leaf is the skirt worn by the girls, giving people the enchanting beauty of the lotus flower without touching the dust.