The theory of color. There are books and books written on this, all geared to improve your art painting. Alas, though, when you look at the canvas, the thing you want to paint, color always lingers in your mind.
The mind sees one thing, the tubes of paint another. So you spread out each color on a pallet, mixing until things look just right. The painting done, you look at the pallet again, sometimes finding it more pleasing than the painting.
You think about it, do you toss out the pallet or consider it a part of the art. There your wild strokes run, unbound by thoughts you might have, just the beauty of your soul…