 A given body never loses or acquires motion, according to Cavendish. Instead, the motion of a body is always its own self-motion. If so, we can draw a conclusion about the motions that occur in a sense organ when an object is perceived. The motions are self-motions. They are not motions that are transfered from the object that is perceived; such a transfer is unintelligible. New motions are not transfered from the object that is perceived (unless the sense organ gets bigger); nor are they impressed upon the sense organ by bodies that travel through the air and stamp themselves on the  organ.[31]  Instead, the motions in the sense organ are self-motions. The sense organ patterns an image of the perceived body, and it does so via motions that it possessed all along: