Ren Descartes (1596 - 1650) elucidated the idea of a separation between the objective reality and the subjective reality, or, in other words, between the exterior world and the interior world. The pre-Cartesian philosophy and literature did not show much interest in this separation between interior and exterior, or between subjective and objective.For example, Aristotle (384 BC - 322 BC) gives the impression to see a harmony between the exterior...