Ballet: Why is it an art??

here is a list of why ballet is a art:

1. most arts (or some) are on the stage, show this is on the stage
2. it's like a painting, the stage is the canvas, the dancer's are the paints, and the storyline is the paintbrush, it works out like that
3. dancers are artists, of course!

well, i'm sure there is more then that, but, thats all for now!