 Cavendish adds that “if it did, the hand would in a short time become weak and useless, by losing so much  substance….”[29]  She instead proposes that when one body appears to move another, it is simply an occasion or prompt for the second body to move on its own. The second body moves in the right way in response to the first body (and the other bodies in its vicinity), but only because all bodies are intelligent and perceptive and (for the most part) agreeable, and they communicate with each other about how to  proceed.[30]  A body B might appear to acquire new motion from a body A if body B at first was still, or a body B might appear to be stationary after a body A “stops” it from moving, but Cavendish supposes that bodies that appear to be stationary are always quite active below the surface: