I have used the limitations of black and white before in artwork and in my sketchbooks. My series Absolutely Your Zen adhered to these rules by following each letter of the alphabet and only rendering each letter in black and white. Artists do indeed need rules. They also need chaos. It's that whole dichotomy thing.
Anyway, I bought a new Moleskine sketchbook and decided to keep it black and white. Doodle doodle doodle. Well, artists also know when to violate rules. Even the rules of art. Yes, Art does have rules. And one of those is that all rules are meant to be broken. I only have a few pages done but already I have strayed and introduced neutral beige and a shot of bronze metallic paint. Those artists. So unpredictable! This is why we could never serve in the military. All that questioning, all that outside the box-ness, all that independent thinking......
We all play our part in this world.