The results of my 5 min head exercises sent me back to looking at proportion. Every book I have has almost the same basic proportions, each laid out in a slightly different way. I "know" these proportions but I don't know them. Betty Edwards suggests that learning verbal reminders can help push past stubborn problem areas. Dan Dennet says "Every time you read it or say it you make another copy in your brain." This page of notes is roughly from Drawing on the Right Side of the Brain. I got a bit lazy towards the end.