... that the perception of the individual can be tricked, fall victim to misinterpretation and disillusions. Descartes also introduces the reader to the idea that we are actually dreaming vivid dreams and that what we perceive as existence is actually made up from our experiences and individual beliefs as well as the more playful theory that our perception could be the manipulated by a demon and as a result all our senses even basic ones such as principles of gravity and mathematics could be delusions. On the second day, Descartes rationalise the existence of the ego, if there is a demon playing tricks on our perceptions, we surely exist to be tricked, or we are deceived by our thoughts we exist to be deceived, this formed the basis of Descartes famous dictum 'Cogito, Ergo Sum' or "I think therefore I am" On the third day Descartes addressed the idea of God, a dangerous idea ...

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