... like designing a friend. One day you move your hand in a stroking movement along the robot’s skin, and itresponds with a gentle appreciative movement. This gives you a strange feeling:We humans ... representation). Try to show your friend a motion—say, tryto wave your hand goodbye. Then ask your friend to repeat this motion; he willlikely do it quite close to your original motion. Now ... choreographer physically moves a dancer’sarm through the air, “That’s how you do it.” For example, in preparation for arobot painting of a car body, an experienced human painter moves the arm withthe...