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    $\begingroup$ It is also biological, there is color perception hyperphysics.phy-astr.gsu.edu/hbase/vision/colper.html ,See also my answer here physics.stackexchange.com/questions/605951/… $\endgroup$
    – anna v
    Commented May 23, 2023 at 18:43
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    $\begingroup$ The vast vast majority of most objects whose colour you are perceiving aren't emitting a single wavelength of that same colour. It's emitting a mix and your brain is doing an arbitrary interpretation. After all, people with red-green blindness might see your red as green and your green as red. Totally arbitrary. $\endgroup$
    – DKNguyen
    Commented May 24, 2023 at 1:26
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    $\begingroup$ Thanks for posting your question! Hopefully, the combination of posted answers has been helpful! $\endgroup$
    – Ed V
    Commented Jun 19, 2023 at 16:56