"Oh! Yeah, I haven't explained those, have I. Concordances are occasional, regular, smallish - like maybe amphitheater sized? I've never been to one in person - overlaps between worlds. People can go into concordances, but if they leave them, they come out in their usual world. You can't go through one to another world. But you can bring objects - including live things, houseplants or chickens or whatever. So whenever a concordance happens, there are postal offices set up near them and the postal volunteers swarm in and get as much throughput in both directions handled as possible. So when I want to send something I make a package and leave it at the nearest post office and it gets trundled off to the correct concordant site to be sent through. Except when Void and Ambular have a concordance there is no mail because extremely stupid makers and changers prefer to spend the entire time having a tiny stupid war."
If you can't go to Limbo yourself because of its commitment to inconvenience, can you make things that are partly in both worlds? That would make things much easier. Assuming it's too stubborn to allow that, it sounds like the process of passing things back and forth could at least be sped up."
"Makers can't make things start out already in Limbo, but the state of the art does involve train tracks and little carts, is my understanding."
The carts appearing in the concordance instead of having to be loaded and moved ought to speed it up at least a little."
"I mean, concordances happen less often than once a decade per pair of worlds, and it's easier to lose a slip of paper or forget to include a bit of data than to totally miss a package in the roomful of packages. So unless it's shortly before a concordance it is pretty typical to send actual physical objects to the post office and have them loaded up on carts and lined up in a train much longer than the concordance itself. This also allows you to not tell postal workers exactly what you want to send. Messages to Void are often just 'so and so, be advised that this person wrote you a letter' - and then we can conjure up the letter. I do that routinely without having to be notified, with my pen pals. It will be interesting to see if I can do it from here."
Would conjuring things from Limbo be harder than conjuring things from your Earth or from Void? Those both already worked."
"They get everything through, but it's tight. And no, at least normally it is perfectly possible for me to conjure 'letter to Cam number five hundred and eight' or whatever. The question is whether I will be able to conjure letter five hundred and nine, since I don't expect it to be written yet but it should be soon, for values of soon that assume time is passing in my usual timeline at a normal rate relative to my subjective experience."
"I see. This time travel thing is more complicated than I thought. Maybe we should have asked Eyndiel for the date."
"That would've been a good idea. We can ask her when she comes back to collect her pay."
How effectively do you think changers can alter terrain? As it is, bogs and fens and such are mainly used as background for signaling ominousness. If we can turn those into something arable, it's one of the best things possible to impress people, especially the English."