Originally Posted by
Marvo
Bluefinger has a point. It is believed that some woman can see a forth colours. What is meant by this, is that normal people can pick up around 1 million colours. That is, 1 million different nuances of blue, red and green. The forth colour allows the person to see 100 million nuances, effectively allowing her to pick up more details in pictures and colours. This ability is limited to women though, because of some business with genes building for the eyes are mainly strapped to X chromosomes.
This was actually mentioned in a thread somewhere else here on DreamViews. I think guerilla made it, but I can't really remember where I saw it.
Also, correct me if I got something wrong :P