Originally posted by seer
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Let's go for the following example slightly influenced by Descartes (who by the way neither needed to assume the existence of reality in order to sense it). I start to get in doubt whether i actually sense the real world or whether I am being betrayed. This leads me into thinking about different possible explanations of sensing and reality. I am not making any specific claim or assumption about reality. All I do is to look for something that would be a plausible and fair explanation of what I would usually call sensing but which I no longer assume has a direct correlation to reality. Then, going through all the different philosophical ideas (not making any assumptions) I come to the logical conclusion that direct realism is the truth and that other explanations are wrong. Thus I have come to the conclusion that my sensing of the world is a direct sensation. I have not had an assumption of the existence of reality beforehand. It was not needed. I was in doubt and I found proof. As long as this type of proof is based on philosophical thinking and it is not just the claim that "reality exists because reality exists" then it is not circular at all. And in order to prove it wrong you need to look at what they are actually saying.
Now that was just a short example. The world is full of interesting theories on this.
You seem to suppose that sensing is a layer between the observer and what is being observed. Thus you seem to think that one can only get to the layer of sensing and need to assume that the layer beyond (what is being observed) exists. However, if that theory of sensing is wrong, then direct realism seems even more plausible.
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