The Periodic Calendar

I can't tell if this is cool or overly complicated, so let me just say it's "neatly confusing." I'll let the guy who made it, Joey Sellers, try to explain it in a video below. As for trying to understand it for yourself, there's a huge version to look at available here. Basically, it's a wall calendar with EVERY possible year on it, due to what day each year starts on. It's huge and ridiculous. (via)