"...Fascinating." At some point, Lancir lifts a hand. "If you're curious, what you're doing is showing up in my Sight – here, have a look." He unshields so that she can read it off him. "The one for nightmares – here – almost just a standard block like we'd do, but there's no way I could get it in where you put it." It shows up to him as a net-like structure, but draped through part of a floor and wall, overlapping the same metaphorical space. "Mine have to go around the long way, more interference with other functions. Yours is much neater, though I have to say it doesn't look very durable."
"And the other ones..." He points out a region by dint of poking at it very slightly so that it brightens and wiggles. "You didn't add anything, or take anything away – you just moved it." There is, in fact, a place where it looks like the metaphorical rickety-ladder has been slid over relative to another structure. A tapestry – which turns into something a lot more complicated and three-dimensional when Lancir looks closer – is now on the other side of a window, thus avoiding a cobweb strung across from the ceiling, but the cobweb itself is undisturbed.
"Those are the obvious ones," Lancir adds. "I think a lot of what you're doing is...happening somewhere my Sight can't quite reach. I only have a partial view." He shrugs. "Anyway, carry on. I don't want to slow you down."