The way I imagine it is in line with the colour spectrum; the red as the lowest frequently is the bassist deep sound with lower rises and falls (like the gutteral growl in the throat of a rabid dog) through to green in the middle of the spectrum being the more even tone and on through to the higher pitched purples with quicker more urgent changes in tone (almost like that annoying mosquito buzzing around your ear lol).
For white I imagine that as being a very chaotic sound with all the colour and frequencies vying to be the prominent colour.
Well that's how my strange head works anyway lol good question though