Why Nijinsky's Afternoon of the Elves and Sacrifice to Spring are modern ballet, not modern dance.

The understanding of ballet is wrong. Ballet originally meant ballet and dance in the west, not just toe dancing. The emergence of modern dance is in a certain rigid stage of ballet development, with the starting point of anti-ballet and liberation of the body. This concept has indeed achieved the goal of liberating the body to a certain extent. Later, ballet also accepted this idea in the development process, and gradually defined the name of modern ballet. However, practice precedes concept, such as Afternoon of the Faun and Sacrifice of Spring.