Hey.
Humans have trichromatic eyesight. (Three primary colors: Red Blue Green, as we're talking about light).
Some animals (including birds) have tetrachromatic (4 primary colors) sight, and their forth primary color is in the ultraviolet range. Thus that means that there are actually colors out there that we don't see that we may be able to someday through genetic modification.
See, the way that it works is that in your eye you have 3 different types of cone cells, and each process a different color channel, red, blue, and green. Birds have four, red, blue, green, and ???.
(P.S. You just got SCIENCED!)
I was reading an article about this not long and it was about modifying genes to be able to see more colours. There were also studies that some females have tetrachromic vision and it allowed them to see more shades of red, which would normally appear as one colour.