What is the reason why Foucault fiercely criticized and at the same time clearly defended the artistic principles of ballet?

If Fu Kun's criticism of classical ballet when he created his own "new dance drama" is a recognition of Duncan's artistic thought. Then, in the face of later modern dancers, such as German Weigmann and American Graeme, Foucault held a fierce critical attitude, and at the same time clearly defended the artistic principles of ballet. He said: "The advocates of modernist dance compare it with ballet art to prove its realism. They call ballet "completely artificial". For those who only regard ballet as a form of dance (that is, tiptoe dance), this statement seems fair. The image of a dancer wearing a transparent tulle skirt and dancing gracefully on tiptoe hides the great art of ballet. The concept of diverse art was stolen by some form of ballet. " In view of this, Fu Jin expounded the artistic beauty principle of ballet from many aspects, and thus explained his own dance beauty. First, Fu Jin believes that "the worship of beauty is linked to the healthy development of the human body". He said: "People choose the perfect body for dancing and make it develop as harmoniously as possible, thus becoming a tool for dancing ... When women and men bare their bodies or use tightly wrapped materials to draw the lines of their bodies to the maximum, modern female dancers are actually hidden in the fog of materials. In most cases, they perform in black robes (in order to appear "serious"), showing only their hands and feet ... I dare say that people who are deeply interested in this dance are people with poor body shape ... They deny beauty and say that beauty is an old and unnecessary concept, just because they can't express it through their own movements and their own bodies. " Secondly, Fu Jin believes that "dance is mainly an expression of joy, showing light instead of darkness". He said: "It seems easy to show sadness in dancing without much action;" However, showing joy requires a lot of actions and is much more difficult. The happier we are, the more we want to exercise ... Of course, sadness, like all feelings, is often the object of dance performance. But it is not sadness but joy that produces dance, and joy leads dance to a regular development. " Third, Fu Jin believes that "the less nervous you are when doing an action, the more beautiful you are". He said, "This is the aesthetics of ballet and any dance. To a great extent, the teaching of dance lies in constantly eliminating unnecessary tension. Weigmann and Graeme's theory is just the opposite. It can be expressed as: be as nervous as possible ... If you want to find beautiful dancing in a lot of photos of modern dancers, people will laugh at you. Everything that has been considered ugly for thousands of years, such as a stiff and tight neck, a head that can't move like a doll, the instep hooked inward, the legs spread outward, the fingers spread apart, the head sideways, and the uncoordinated limbs, are all displayed as the highest achievements of dance. Fourth, Fu Jin believes that "one of the pleasures of dancing is to master the fun of balance. He said: "Schopenhauer thinks that columns and weight are the only themes of architecture. Regarding dance, it should also be said that the harmony of weight and support is one of its conditions. For dancers, nothing is more painful than losing balance ... Most ballet postures can be accommodated in a triangle, with one corner touching the ground (that is,'?' )), each one can be compared to a flower. The farther away from the ground, the more beautiful its lines are.