If the copies are different, the question is not interesting. If the copies aren’t different, what causes you to label what he sees as red? It can’t be the wavelength of the light that actually goes in his eye, because his identical brain would treat red’s wavelength as red.
If the copies are different, the question is not interesting. If the copies aren’t different, what causes you to label what he sees as red? It can’t be the wavelength of the light that actually goes in his eye, because his identical brain would treat red’s wavelength as red.