Hi, just saw this idea floating around in Mastodon.
I wanted to share another public domain book I really enjoyed and even
learned something from.

It is Flatland by Edwin Abbott Abbott.

The source is available on Wikisource: https://en.wikisource.org/wiki/Flatland
I'd suggest using the 2nd edition, since the 5th is still a work in progress.

All of luck for the amazing project!

TobTobXX aka. FiliusPatris