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The question that troubles me the most is why do primary colors exist? Is it that photons (or the quanta within them) spin only in any one of precisely three exact directions? Are these directions the fixed three dimensions of space known as the x,y,z axes? Are translucent objects slightly shifted onto the fourth dimension? So a translucent red glass has its electrons ‘fixed’ on the x axis, but on the y and z axis it has been shifted out of our three dimensions of space? If we could see into the fourth dimension, would we then require four primary colors? And in doing so, would transparent objects then have this fourth primary color?