"blue" isn't real
Posted on: May 2, 2017 at 18:55:20 CT
cnk ATL
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the observed physical attribute that we call "wavelength" can be measured. I may call it "blue" but that has no meaning other than we've agreed, for the most part, that the physical attribute of that light that we are able to perceive is "blue". Someone who can't see "blue" can still observe that wavelength, it just won't be "blue".