

I was thinking of Crystal systems which would be cool because there’s 6 or 7 depending on convention. The only problem is that the “Monoclinic” would have 3-letter abbreviation of “Mon” which could be confused with abbreviation for Monday—I would challenge myself to find a way around it.
The XKCD thing is also great start. Continents would be nice, main-stream way of going about it. (I’m hopeful that people of Antarctica would not feel ripped off if they got the 7th season.)







Hell yeah! And I’m confused af when Sunday happens to be on the left.
I live in Czechia (born in Slovakia) and you won’t see Sunday-first calendars around here unless they are imported. (I bet lot of people even don’t know that in some calendars in the world Monday is not the first!)