@Rosemary I beat Insulation, if you're still looking for that hint :3
small hint
@Rosemary no wall object ever moves
slightly bigger hint
@Rosemary you have to set 
while still inside the walled room
re: slightly bigger hint
@monorail Well, I had to look at the bigger hint. Let's see what this gets me, because I certainly hadn't considered that possibility.
re: slightly bigger hint
@monorail I'm not really seeing it. The only possible sequence of sentences is Keke Is Push -> [Keke Is Up] -> Keke Is Skull, with the second step being optional but probably required or else they would give you the Up word.
I suppose it would have to be between Up and Skull when you change to Wall Is Stop, because otherwise there's no way to get rid of the old words to change anything.
Skull Is Up and Skull Is Push are technically also possible, but since you can't get skull entities without messing up the words' positioning you can't do anything with those as far as I can tell.
Positioning Keke so that when you turn them into a skull they move and swap the Is out will let you get Skull Is Up _after_ Keke Is Skull, but I don't see any use for that either.
re: slightly bigger hint
@monorail It means it becomes an obstacle that nothing can move through, right? Or is there some nuance to it that I'm missing?
re: slightly bigger hint
@Rosemary it means specifically that you can't walk or be pushed onto it
re: slightly bigger hint
@monorail That got me to the answer, but damn. That's one of the less well-designed puzzles in the game, I think. The exact meaning of stop ought to be demonstrated before this one, I think.
re: slightly bigger hint
@monorail Then again, maybe I'm just mad I couldn't figure it out myself.
re: slightly bigger hint
@Rosemary yeah that's fair
it turns out there's another solution where you do move a wall, but you don't use 
that solution actually makes more sense to me because it relies on something (i'm pretty sure) you've already been taught: is asymmetrical (a wall can move onto something else)
but i think it's unintended because of the unused piece
re: slightly bigger hint
@Rosemary it's worth thinking about exactly what
means