[ He affects the voice again -- mostly for his own amusement. ] Dreadful, didn't I say? Terrible taste, really. And do you remember the fiasco with the chandelier? What an awful party.

[ His fingers are sliding carefully along the wall, and he has a sort of system in mind -- examine a one-foot by one-foot area, find nothing, then move on. He's silent as he focuses on his work, then something catches his eye. That long line is different from the usual pattern, slightly out of place. He runs a finger along it and it lights up, glows a sort of aquamarine. ]

Guess we're supposed to find where the patterns don't match up. [ He notices another and traces it with a fingertip -- again with the same result. ]