This is something that puzzles me ..... I understand sound theory pretty\nwell... and we know sound is vibrating air ....for pure tones the air pressures\nvaries as a sine wave.... and, color is a vibrating electromagnetic field\n......again with pure colors represented by sine waves .....\n\nHere is what I don't understand ...how is it that you can, as I understand,\nchoose 3 primary colors..... and mix them to get any color at all ????? It\nseems quite unlikely .... for example.... when three sinewaves of different\nfrequencies are added, the result is not a pure sinewave at a different\nfrequency .... suggesting to me that you can't generate the pure colors, much\nless all the colors.\n\nAnd, no one would suggest that you can take 3 pure (sound) tones and generate\nall the pure tones, much less all the sounds ..... so, what is it about light\nthat is different from sound .. ?????\n\nIs there any easy explanation ???? Or a link I could check, to relieve my\nbafflement????