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The notion of representation figures centrally both in Descartes’ scientific theorizing about sense in humans and in his conceptual speculations about the nature of human cognition.Descartes’ philosophical innovation in the Dioptrics is the claim that sensing in humans is a kind of representing rather than a kind of resembling. This provides the cornerstone for his attack on traditional theories of sense, and it underwrites his own position that sensing (in humans) is a kind of thinking, ascribable to the rational soul rather than to any Aristotelean sensitive soul.

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My aim … is to show that the celestial machine is likened not to a kind of divine living being but rather to a clockwork. (Kepler, 1605)I consider the human body to be a machine … (Descartes, 1641)Although it may exaggerate to say that Descartes fathered the mechanization of biology, it is true (without qualification) that his Treatise of Man provided the first systematic development of the idea that a complete understanding of all the phenomena of life, including all abilities and behaviour of (non-human) animals, can be achieved by viewing living things as machines. To make this out, Decartes had to learn to think about living things in a new way. My first aim here is to identify the fundamental conceptual innovations at work in Descartes’ attempt to extend the new mechanics to include biology. My second aim is to locate the point at which Descartes’ mechanical imagination runs out. This requires study of Descartes’ scientific work on sense.