"Well, let us answer that by taking an inventory of what we know they do. They perceive all the other monads, then think, so that they may act. The thinking is an internal process of each monad—it is not supplied from an outside brain. So the monad must have its own brain. By this I do not mean a great spongy mass of tissue, like your highness’s brain, but rather some faculty that can alter its internal state depending on the state of the rest of the universe—which the monad has somehow perceived, and stored internally."