In meditation one Descartes contemplates what can be called into doubt. What he is doing is questioning if what we see and experience is real or if we be being deceived. Perception is something that is our own. The way that one person sees something may be completely different to someone who is standing right on next to them. In one transportation system Descartes questions if beliefs ar unworkable even though they are derived from the senses. He gives the example of him sit down by the eject in his pajamas writing these meditations and asks the question how could it be denied that these hands or this whole body is mine? He then compares himself to mentally disturbed people saying that the mentally disturbed sometimes think they are kings or draining clothes when the are naked or that their heads are make of something other then bone and skin. What he is saying is who are we to question someone elses sanity. What is it that makes our perceptions reality and his incorrect?
In the next passage Descartes presents the possibility of deception in dreams as a sympathy for skepticism. He begins by saying that he has the aforementioned(prenominal) experiences when he is sleeping that crazy people do when they are awake, and sometimes even more improbable ones.
Descartes then questions how one could tell apart whether or not he was asleep or awake. He says that often when he is asleep is convinced of events that are identical to reality, such as that he is sitting by the fire in his pajamas, when he is in fact asleep in bed. In a dream he could do the same thing as in reality to convince himself that he was awake such as look at a paper, shake his head or touch his hand...
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