Just as Louise was about to double-back to the first floor, the seventh year had this strange feeling in her gut to return to the piano and have another look. The piano was a good hiding place, but if only she knew what she was looking for?

Not eyeglasses, apparently, because she hadn't seen any. What else did she know about the ghost who haunted the second floor girl's bathroom? Wait, there was that hidden chamber in the bathroom, wasn't there?! Squinting as she tried desperately to focus and recall her British Magical History, she sighed. What amends a house? Windows? Locks? Latches and keys? Faucets? FAUCETS.

Wait. There was a broken faucet that led to that secret chamber. There was also the mirror... mirrors were very important to boys and girls at the castle, especially adolescents. And they were definitely prevalent in bathrooms. And they amended houses, but they didn't build them, per say.

Carefully, the seventh year lifted the lid to the piano again, peering inside, hoping one of the things she had thought about in relation to the girl's bathroom would be inside. She just needed to look closer ... thinking admittedly that a mirror probably made the most sense to be hidden. One of the handheld kinds, likely.