Since we presumably leveled Hazou's MechApt, I propose a simple project: the pantograph, an often-discussed project.
It is a simple mechanical device that can be made to duplicate drawings, which was not invented until 1603 IRL, where as the printing press was invented in 1440.
Given that sealmasters probably do not specialize in MechApt, I considered this far from obvious. Their to-go tools for inventing things is probably sealing first, or learning to draw faster, rather than mechanical means.
For Hazou to hit on the concept and invent the idea, we'll need to lay the breadcrumbs.
Source of inspiration:
- Hazou wishing he has an extra set of an arms so he can draw more seals at the same time.
- Hazou knowing that a machine existed in Konoha that printed books. He imagines it to be a series of arms.
- Hazou learning from books about the concept of 'translating' a shape, and then hitting on the idea of keeping brushes at the same distance from each other.
- Hazou noting that the arms bend when he draw.
Any ideas? Comment? Criticism?
What does the pantograph means for sealing in general? How lethal would that make the team?
A couple things come to mind.
You're going to need to invent some sort of pen. Brushes would seem to require a 5-axis polygraph to be practical.
While the idea of micro-seals is certainly tempting, this technology raises the possibility of making invisible seals viable for anybody rather than just somebody with the iron nerve. That's a major concern if invisible seals end up working out. This may be one of those technologies we want to quietly forget we ever thought of, at least until we're already running the world.