... he has experienced sensations of being in a specific situation and not at the time known it apart from reality; as such he feels he should hold reality in the same light. However he goes on to say that even in dream there is a little reality in the example of the way that a painter cannot create a new being on a canvas, it is made up of a variety of other "real" beings. Descartes goes on to speak in a similar way to the Pythagoreans of the more concrete truths which are to be found in math and geometry; two and two will always equal five be it in a dream or in any other situation. However he feels that even in this "truth" one should not place one's trust entirely. This is because of the possibility that some evil beast might have influence over his senses if this ...

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