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second mind blow: due to the curved, convex shape of the visible light perception, it is impossible to find three light sources that when addictively mixed together will be able to represent every visible color. Mixtures between the colors will always form a triangle between the three colors in the above graph, and there is no triangle that covers the whole space with its vertices corresponding to a color that actually exists.

So there's no way to build a perfect display, at least not by using only three colors.