"Flowers are not flowers, fog is not fog, don't forget the road you have traveled." Which poem is this? What artistic conception did you write in? What do you mean?

This is a love poem, a hazy love poem. When I started reading, I didn't know what to say, but I felt an ethereal and blurred image flash by. It dawned on me at last that a woman had come to meet me. The first two sentences vaguely describe the scene at that time. What does this scene represent? The author didn't say. In three or four sentences: "Come at midnight and leave at dawn", who will come and go? Still don't get it. In the last two sentences, the elusive original intention is revealed by the method of "borrowing death to express ambition" Poetry is really ethereal and elegant, subtle and graceful, giving people a hazy beauty. And there is a touch of sadness between the lines. Later generations took "flowers are not flowers" as their phonetic names. The whole poem was set to music and widely sung.