I'd suggest a different describtion of "color space", more precisely different coordinate system for that space. The motivation is that it corresponds more closely to our color perception and I think it's aesthetically more appealing. I mean we don't perceive white as a mixture of equal parts of red, green and blue.
Adopting spherical coordinates, we've got an azimuth angle describing the hue, expressing that color hues align in a closed circle and are characterized by only one number. The polar angle descripes the lightness or value of the color, ranging between the extrems of pure light and total darkness. Quite a relative coordinate in our perception. The radial coordinate descripes the croma of the colors. The smaller the croma, the smaller the change in our perceived color if hue changes by an equal angle. Hue is not defined for the central axis in our perception and in the coordinate system. All the colors align on a sphere.
There is also a drawback of this color scheme, namly that different colors reach their maximum saturation at different values, so if the value is stricktly defined as our perception of lightness, colors do not lie on a sphere anymore:
Wendy, you're confusiong "color" (qualia) with "electromagnetic wave" (physical aspect).