This is the polar coordinate equation that Descartes used to express his love to his wife. Painting is a kind of love, but you know Descartes' wife is also a math student. You can interpret it. Generally speaking, it is basically impossible to draw. He makes you think ... Is it really funny? May I say so? Actually, I still have to ask Du Niang. Implicit confession can be changed in another way. It may be that boys accidentally see such a confession formula and find it strange to use it.