http://en.wikipedia.org/wiki/CMYK_color_model
also, what levels of red, 24k colors in RGB color space?
this is not necessarily true, and some creatures, bees, see in color frequencies humans don't, perhaps, and most likely, humans have a variable range of frequencies (oh wait, we have colorblind people)
Sorry, not brainwashed by sesame street even though I loved it as a kid.