I discover that to have the most simultaneous color contrasts with three colors after several attempts I select the blue, the red and the green color. Is this due to the fact that I try to visualize colors at the most contrast on a monitor screen?
Working with stripes, tiny lines that create an optical effect when they are moved, and adding the spectrum colors on the top pole, and red/green, for simultaneous contrast on the down pole, I've put at the equatorial line (is this term possible in a cubic 'system'?) the images of a linear spectrum and an absorption spectrum. Maybe the sun spectrum?