I believe that the these effects are more based on the biochemestry of the eye than optics. There is also a stong fight between green and red.
I noticed the other day that the red writing on my bass speaker contrasts with the grey metal in such a way that it appears embossed.
Anyway, my point about the blue painting was that has a moral aspect because an artist can choose to effect people in ways that have a moral side to them - If an artist wants to adjitate then they might make a blue and red painting for example. I chose the example because it shows how there is a little bit of morality in everything we do and so saying that there is no moral side to your work seems naive to me.
Obviously there are some cultural differences between people and those have to be taken into account.