We made an extra arm! We took off a sleeve from another shirt, then made a hole in our existing shirt on the side abdomen below our original arm. The new arm was meant to mimic the movements of a real arm, and be adjacent yet opposite of the arm controlling it. Perhaps the torso arm could pick things up for you? Perhaps it could ~hand~ you a cup of coffee. The arm could be more than just a thing in two states, yet because of the duality of the movement, it certainly seems limited to two states.