What do these two poems mean, "When you come like a dream of spring, you go like a cloud without finding a place"? What is the message?

first of all, look at the beautiful artistic conception of flowers in the fog. Flowers, fog and clouds in poetry are concrete and vivid images, but what do you write about "flowers are not flowers", "fog is not fog" and "going like clouds"? In the process of creation, the poet skillfully used implication and ambiguity. The so-called implication is one of the typical forms of discourse implication of the text, which means that it contains or contains infinite meaning in limited discourse, so that readers can appreciate infinity in limited. "The implication is not shallow, the language is endless, there is a aftertaste in the sentence, and there is more meaning in the article." (Qing-Shen Xiangnong) In this poem, flowers, fog and clouds can generally be clear and beautiful artistic conception, but "flowers are not flowers", "fog is not fog", "coming like a spring dream" and "going like a cloud" are as beautiful as flowers, as light as fog, as drifting as a cloud, as beautiful as smoke, just beyond my reach. Vague and implicit, implicit gives birth to an ethereal artistic conception, which leads to different thoughts on love, pursuit of ideals and life, which is intriguing. Those who are attached as soon as possible and have a lasting appeal are words to achieve the * * * sound of the soul. At the end of the poem, but can't catch a trace, even the shadow will be lost, only to end up empty. Deep regret, how can people not aftertaste?

Secondly, it is the beauty of distance between illusion and reality. The beauty produced by distance is a sad beauty. "Come at midnight" and "go at dawn", such a short encounter, a kind of emotion, a lover, a kind of sustenance, a kind of pursuit and ambition, suddenly produced and instantly disillusioned. These seemingly love and in-depth analysis for the ideals and life of a variety of uncertain meanings, it is difficult to ponder while reading, and the aftertaste is repeated. This is the potential of rich meaning generation in the discourse system brought by ambiguity. The last two sentences "coming like a spring dream is not long" and "going like a cloud without finding a place" are the synthesis of these images, such as flowers but not flowers, fog and fog, flowers in the fog, coming like a spring dream and going like a cloud. A pair of hazy artistic beauty, reflecting a touch of sadness, makes people memorable. This is the literary charm brought by the implication of words.

The whole poem, from the implicit small to see the big, from the vague one to generate more, has the characteristics of * * * and the discourse system that explains poetry has rich possibilities of meaning generation, that is, discourse implication. No matter from the process of the poet's literary creation activities or the rich images, beautiful artistic conception or sad tone contained in poetry, poetry can bring people thinking and achieve * * *. I think this is the enduring charm of literature. After a long aftertaste of Bai Juyi's Flowers Are Not Flowers, perhaps there will be more profound experiences.