it was more establishing the limitations of the dweomer - a high enough passive insight will see through it, and I find it cool that in those cases, the insightful person actually sees both at the same time (idea cribbed from Eddings, btw). And of course, it doesn't hide texture, it only fools the eyes.
Ah, I see. I did know about the tactile limit of the illusion (if we ever reach Epic I'm going to quest for one that covers both touch and sound as well as sight), but I wasn't aware of that about a high passive Insight, good to know.