What this is trying to say is that human languages all over the world come up with color names in a similar path, but they stop at different points.
It's all very fascinating, and interestingly is the argument some use against strong AI -- that is they believe that to truly understand language you must have a human or human-like body that can perceive the world in the same way as a human, because these color words develop based on the physical properties of your eye and brain. For example, many people that are blind from birth have a hard time understanding the concept of color.
A few of you mentioned that Russian has two words for red. Russian is actually at the end of the spectrum (pun intended) -- that is they have the maximum number of color words.
English is close but we don't have separate words for blue and light blue.
You can see this as English speaking children learn words -- they will call "pink" "red" until they learn pink, and will almost always learn "red" before "pink".
Some cultures just stop with "warm" and "cold" (which are red orange yellow vs green blue purple).
Ah the joys of being a CogSci major -- we had entire weeks of classes devoted to this.