a common space for harmonic overtones
|I'm trying to find an information about sound-color relations. One of most commonly system used - associates C with red, D with orange, E with yellow and so on.
My question here is: Where from this system of associations came from? When and where it was created?
I know other systems of color-sound tuning (like the one, based on octaves, where C is green if you follow up the frequency), and I'd like to know if this one - is a symbolic one, or if it has a deeper (pysiological? philosophical?) background.
Whoever I ask - nobody knows, but all of them - use this association scale. Can you help?
And I'd like also to know if there are other "technical" association systems.
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some link from tone to geometric shapes to color: I have seen a pile of sand on a metal plate form a pentagram when the plate was struck with a tuning fork-