There are some who would say I have not followed the theme very well. I would just like to say that I covered the theme by treating it as "negative space". The idea is that by covering every other theme it leaves a blank area where the theme should be - perfectly illustrated (in lights and darks!) by the image on the right.
I have found out which one of these two colors is the negative space. I have a miraculous proof which this margin is too small to contain.