Such inventions led scientists and philosophers to speculate that the human brain itself was just an elaborate automaton. Wilhelm Leibniz, a contemporary of Isaac Newton, wrote around 1700: "What if these theories are really true, and we were magically shrunk and put into someone's brain while he was thinking. We would see all the pumps, pistons, gears and levers working away, and we would be able to describe their workings completely, in mechanical terms, thereby completely describing the thought processes of the brain. But that description would nowhere contain any mention of thought! It would contain nothing but descriptions of pumps, pistons, levers!"