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But if you see them, do they then exist? Why don't they exist if you see them?
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Firstly, most people in the world would look at my face and be able to confirm that there were no spiders. Secondly, sight is but one of methods of detection, so a person could pick at my face and confirm that they could feel no spiders either. And just to decrease the chance of human error, we could fire a few electron streams at my face and confirm that there were indeed no invisible-intangible-but-physically-present spiders.
However, I'll assume that by 'see' you really mean 'percieve'. The entire human race
is under mutual illusion in a way, for instance we detect infra-red radiation as a sensation of warmth while just a stone's throw up the electromagnetic spetrum we interpret the radiation as colour and image. They are essentially the same thing at different wavelengths, so one of these methods of detection (take your pick) is provably limited.
These limitations of our senses mean that there are things that certainly exist but we cannot percieve, while the simple capacity of humans to be idiots accounts for the inverse.