This isn't the final thing. I still have to tweak some things, like decide which borders to keep and which to remove. And, of course, write up some instructions to place in the middle. But before I go any farther, I thought I'd ask: can people figure out roughly how to use it? Can you guess how the shading is supposed to work?
Also: should I try to squeeze the names of the seasons in there, somewhere, or is this plenty?