Clarence Zimmerman wrote:

well; I guess that depends on how you look at the problem (no pun intended...)

Philosophically? Biologically? or Psychologically? I bet we could even apply mathematics to it too.

RED, mathematically it is a specific wavelength of color. Our photoreceptors receive this information and our brains report it to us.

Technically speaking you are correct that we can each see that same color differently if our photoreceptors or the receiving end of our brain are not working properly. However in my comment I mentioned this. If our brains and eyes are biologically "perfect" we do see the same way and obviously the world is not a perfect place including human biology.

Here is a good and much more precise read on this from UC Santa Barbara http://scienceline.ucsb.edu/getkey.php?key=719

What do you measure perfect on? We can typically see a greater range of what we call greens because we have more cones for it, but also we suspect because the earth is mostly green on land, and those subtle distinctions are important. However that doesn't define what green is, or is supposed to appear to be if a person is not defective as you're stating.

Sir JC- Boutique78 wrote:
This is a great topic to mull over with a nice, fat sack of herb.