That's really interesting, well done.

[ Honestly, just having self-copying things is helpful without having to do everything involved in a printing press. ]

Does it copy everything exactly -- handwriting and all, even drawings? Does it happen in real-time -- that is, can someone watch you write it from another book? Can others interrupt you? Or or or, if someone else scribbles out what you've written, does that also show up in the other books?

[ Questions! ]