Describe symbolism in Wunderkind by Carson McCullers

The author makes several graphic references to hands in the story by describing the hands of both Frances and Mr. Bilderbach. Clearly they are the instrument of a pianist, but as Frances realizes that her stamina and prowess are lagging, her hands shake or lie limply on her knees. The hands of the robust Mr. Bilderbach seem never to be still even when at rest, as if his passion for the music is ready to pour out of the tips. Frances' fingers are tired and one is even bandaged from the pain of repetitive motion, symbolizing her wounded spirit which has been worked into exhaustion.