Whether the black fan loves stalks or not shows that the old man's painting skills are not so good. From the comic dialogue between Degang Guo and Yu Qian, Chyi Chin Calligraphy and Painting, Yu Qian's father painted a beautiful scene for Degang Guo: Yu Lao asked Degang Guo: Does the big movie star love him? I'll draw you a Zhang Ziyi. When I went to get it, the old man asked: Does Yao Ming love it or not? A few days later, the old man asked again: Do you like landscape painting? When I went to get it again, the old man changed it to: Does the black department love it or not? This stalk is poking fun at the old man's poor painting skills, especially scribbling, and he can't see anything, just saying it's a black sector.