 When we were children, we learned about Roy G. Biv, the colors of the rainbow, red, orange, yellow, blue, indigo, violet, Roy G. Biv. And so these are all the colors of the spectrum, but your eyeball can only see three colors. Everything else is a combination of those three colors. So therefore, when you look at brown, you're not really looking at the elemental brown, you're looking at an approximation to brown. Now, look at the colors of stars.