I have taught my students not to apply rules or mechanical ways of seeing.
If you don't do it my way, I suggest you commit suicide.
A painter paints because he has no time not to paint.
Simultaneous contrast is not just a curious optical phenomenon - it is the very heart of painting.
As basic rules of a language must be practiced continually, and therefore are never fixed, so exercises toward distinct color effects never are done or over. New and different cases will be discovered time and again.
In order to use color effectively it is necessary to recognize that color deceives continually.