Some of them seem completely arbitrary. Others vaguely relate to the law involved - e.g. #6 where the circles share a common boundary. I prefer the rules in my

Some of them seem completely arbitrary. Others vaguely relate to the law involved - e.g. #6 where the circles share a common boundary. I prefer the rules in my copy of Design Elements - A Graphic Style Manual. Its rule #2 make a comment that is apt here: communicate don't decorate.