"Simultaneous contrast results from the fact that for any given color the eye simultaneously requires the complementary color, and generates it spontaneously if it is not already present."
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"...The first gray is bluish, and intensifies the simultaneous effect; the secondary gray is neutral and suffers simultaneous modification; the third gray contains an admixture of orange, and therefore fails to be modified..." - THE ELEMENTS OF COLOR - JOHANNES ITTEN

- with 35 colors and 3 types of grays - #tezos4tezos -

"Colors are forces, radiant energies that affect us positively or negatively, whether we are aware of it or not." - Johannes Itten