From the top of the watchtower - it's not very high, but it's up on a little bit of a rise, and none of the other buildings are very high either - it's easy to get a good view of the city.
"Metaphor: Two infinitely wide sheets of paper, one an inch above the other; no matter how far you go on one, you'll never get onto the other. Punch a needle through and travel's possible; pull it out again and it isn't."
"...scrying works in three dimensions..."
Sometimes it's like talking to a very small child and sometimes it's like talking to someone very smart who knows a lot more than she does. Visiting other dimensions is bizarre.
"Line segment: One dimension. Square: Two dimensions. Cube: Three dimensions. What's next?"
"...is something next? How many nexts are there? Why can't we do anything with them except apparently be randomly kidnapped for no reason?"
"It's theoretically possible for something to be next, up to an infinite level, but we observe there doesn't seem to be that we can interact with. People can model how it would work if it existed. A way-of-thinking-about-it-that-might-be-true-but-probably-isn't is that your three-dimensional universe - everything you can get to by walking or flying or otherwise moving from here - and my three-dimensional universe are a few inches away in the fourth dimension, and we could just cross over if we knew enough about how the world worked. Only I can't actually answer your third question, other than 'because I don't know enough.' It's also possible that they're the same universe and there's some reason that magic only works on this planet. I don't know, because this is the first time I ever heard of anything like this happening."
"I don't see how it could be only a few inches - or, I suppose it could be a few inches in that one way and much farther in other ways, but if it were right next to us, even if we couldn't see it for some reason, sound goes in all directions, and heat..."