So I'm coloring with my daughter yesterday and I start thinking about the Physics behind the mixing of colors. There isn't really a "connection' that should bring the violet end of the spectrum back to the red in a color wheel when thought of in terms of wavelengths...or is there? My first thought is that maybe the frequency of red mixed with the frequency of yellow might make a phase-differential on the order of the true orange range. But if this were true couldn't we do the same with any EM source (i.e. mixing radiowaves with x-rays and "seeing" green). I haven't researched this in any way, and I apologize for my sloppily-written post. I'm sure the answer is well-established, does anyone know it?