[She smiles faintly, glad to hear that the project is useful to their current group at least.]

You're right... the nature of the Crossing is uncertain, isn't it? I do understand it to be a physical move away from this location, but that hasn't really been confirmed.

[How sure can they be that it won't instead be their state of mind that'll be altered? As a matter of fact, who's to say that the place they find themselves in right now indeed exists on a physical plain?]

I'll see if I can leave a copy of the maps behind instead of the originals. If I tear the pages from my book, they might disappear from everybody else's, too.