What if
'it turned out to be a body which, by its various motions and encounters, produces what we call thought? How do you demonstrate that a body is incapable of thinking, or that corporeal motions are not in fact thought? the whole system of your body, which you think you have excluded, or else some of its parts - for example those which make up the brain - may combine to produce the motions which we call thoughts.'
W. p.21,2.