The  beautifully  executed  pirouette  of  a  ballet  dancer,  the  powered  backhand  of  a
tennis  player,  the  fingering  technique  of  a  pianist,  and  the  coordinated  eye
movements  of  a  reader all require  a remarkable  degree of motor  skill  that no robot
approaches. Yet once trained, the mot or systems execute the motor program for each
of these skills wit h ease almost automatically