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I had this conversation with my 10 year old son last night...
We both decided that because the wavelength of light is different from colour to colour that indeed colours do exist as different wavelengths of light.
That said, we also agreed that while we agreed upon the fact that the word "red" described that wavelength we could not completely confirm that what we were seeing was the exact same thing (i.e. if I were to somehow be able to see through his eyes with his brain, the colour the we agree to call "red" might look like the colour that in my mind with my eyes we have agreed to call "blue").
In the end, words are just signifiers of the original object.
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"My hands are on fire. Hands are on fire. Ain't got no more time for all you charlatans and liars."
- Old Man Luedecke
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