As someone who is colorblind, how do I know I can trust someone when they tell me what I’m seeing now is red when my concept of red itself is impaired by a lifelong inability to properly see it?
How do any of us know that we perceive colours in the same way? I mean I get that for most non-colourblind people we interpret a certain wavelength with a certain colour and because we’ve always done so we can identify say 4×1014 Hz as red. But how do I know that the “colour” my brain perceives 4×1014 Hz looks anything like the colour someone else’s brain perceives the same thing? For all any of us know a “hue-shift” might just be making us see the the world as other people do!
