Descartes: Diagram showing the ventricles of the brain (E) and pineal gland (H). A & B are fibers ending in walls of ventricles. Illustration from 1664. Rene Descartes (1596 -1650), French mathematician and philosopher, created co-ordinate geometry, a bridge between algebra and geometry, now known as Cartesian geometry. He is considered a founding father of modern philosophy, famous for his statement Cogito ergo sum (I think, therefore I am).

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Keywords: &, 1600s, 1664, 17th, anatomy, art, brain, bw, cartesian, century, descartes, diagram, fibers, gland, history, illustration, medical, nervous, pineal, rené, science, scientific, showing, system, ventricles, walls