The piano playing is a life activity of the unity of heart and body and the
unity of performer and piano. Whatever the forms of expression are, as for performer
and piano, body and heart, and the spirit and the flesh, each two divide but unify.
According to the rule of opposite and unity of Yin and Yang, performers should pay
attention to the change of the arm and wrist, the change of the breath, the state of
touching clavier and the change of location, and the change of style.