It's the future!
Think about it: when global warming causes the seas to rise, the USA could easily become islands, and if there were to be a nuclear apocalypse/ WW 3
then civilisation would probably step back a few millenia or so. Presuming Korea came off the better power they would have it in their sights to take over the world. Though it is set in the early 20th century, a few years out of the Victorian era, the years could be numbered from a new starting point: perhaps when civilisation became clever enough to map out time and separate it into lengths again
, or from when the big war ended, or from when the measurements of the past were re-discovered?
It's set in the same world as something else
- Harry Potter
- As stated on the main page, Rithmatics can be compared with Arithmancy: but what if it is Arithmancy and they just don't know it in America yet at that point?
- Nalizar could be a young Snape before he's discredited and has to adopt a new identity and life: but he doesn't change his ways. We know that people like Dumbledore got very old (even without the Philosopher's Stone), so Snape/ Nalizar could.
- ChalkZone: what happens when our Kid Hero grows up and needs to use sentient chalk drawings to protect himself from bloodthirsty ones?
The Scribbler used more than just the two new lines
- The question of how the children disappeared was resolved, but how the Scribbler got to them isn't made clear in the cases of Calloway and Linton - did the Scribbler sneak into the knight-senator's house with all the security around? He has the Line of Silencing, but he'd also need not be seen. It's possible that he used a Portal Door as in Pan's Labyrinth.
The chalklings were created or awoken by the Native Americans
- Sanderson's descriptions of the chalklings (and to a lesser extent the other Rithmatic drawings) evoke the petroglyph art of some Native American peoples of the Southwestern USA, and Joel reads about Spanish explorers finding Rithmatic drawings in "Zona Arida" (Arizona). Perhaps the Native Americans accidentally created the first chalklings and then were mostly wiped out or driven south by them (as is hinted) which might also have something to do with why America is shattered into islands.
There's a Sixteen-Point Circle
- All of the previous circles have geometric reasons for how many points they have and where the points are places. The two-point circle is based on the circle's diameter, the nine-point circle has bind points based on a non-obtuse triangle, etc. The story makes it clear that people don't know everything about rithmatics, so it stands to reason that there are more circles that they don't know about too. Why a sixteen-point? It's bind points are the points on the unit circle.