While I acept the significance of complementary colors, the significance of triadic, split complementary, analogous and split complementary is open to debate. One issue is that almost all discussion of co called Colour harmony is around hue. Yet no hue exists without a lightness and saturation value, which have their own impact upon the aesthetic design.<p>More broadly, Colour harmony is something of a bogus science, with its roots in the very beginnings of Colour science. Newton himself added an seventh Colour to his hue wheel just So that Colour would be anagous to musical scale. It didn’t stop there... Goethe, Itten and Kandinsky all followed suite. All claimed that Colour could be subject to high-order ‘good contrast’ known as harmony. As an art student, this bogus thinking was nothing but damaging, and took me years to shake off.