What is fascinating to me is that while we do know a lot about how color is produced and the structure of the eye, we can never really say for SURE that my gree

What is fascinating to me is that while we do know a lot about how color is produced and the structure of the eye, we can never really say for SURE that my green and your green are perceived as the same shade for both of us. There are people with synesthesia who map sensory input to different senses (They 'feel' sound for instance). I don't know if we'd ever be able to discover that everyone maps colors the same way in our minds in that sense.