I can point to a blue pillow and say that the pillow is blue, and since most of us have eyeballs, optic nerves, occipital lobes, and human brains that generally function the same way when it comes to visual processing, we can agree that I am right. However, we can’t actually know that what we see is the same blue, because we cannot see into each others’ minds. Although we both agree we see blue, we cannot know if we are actually having the same mental experience, or qualia, of what we are calling blue. This and all other problems related to the disconnect between our perception and what is
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