"Yeah."

"Anyway, first order of business: gates. Can you make one on top of mine?" she asks, gesturing at the invisible location where the small WiFi-distributing gate is present.

"I can't sense the exact location but I can make one where you pointed if you don't need them flush next to each other."

"No, I mean directly on top of it." She surrounds it with fairylights.

"...again," says Promise, "I can make a gate where you're indicating but if you need them extremely precisely located relative to each other you're going to want one caster to make all of the gates in the set."

"Hmm, alright. I was just wondering whether anything interesting happened in case two people put gates exactly on top of each other. For that matter, does anything interesting happen if one person does that?"

"I think it's supposed to be impossible to put them exactly in the same place."

"What, like, in principle?"

"I think so? I don't remember, I haven't read up on gate theory recently."

"What about if it's closed?"

"Same thing, I think."

"But since they're basically infinitely thin that's not a good way to check for gates or tears."

"Yep."

"And is there any work at all on whether the presence of gates affects local harmonics in any way?"

"Not that I've read, but it wasn't relevant last time I looked into it."

"Hmm."

So how about a grid of fairylights around the gate to see if there's anything obvious there?

Nothing that obvious. It's hard to be sure, especially in daylight.

Right. Daylight. "Does it ever become night here?"

"I'm not sure -"

"Oh, once in a great while," says a local fairy.

"Hmmmm. How great a while?"

"Every few years."

"Oookay, I'll—wait, why am I even asking about that, I could just find a room with blinds."

"Or bring a box here and put it over the gate."

"...or that, yes, does anyone have a box?"

Nobody has a box of a size comfortable to fit Promise or Sadde in handy but one can be constructed.