This mirror, Ariana found i exceptionally stunning, because instead of it showing yourself and the existing corridor it showed a rather elegant background which the seventh year just found breath taking. She had wandered up here once a few terms back and was puzzled by the mirror yet she found it beautiful and ever since then she wandered up here a few times just to look in the mirror, to see if there was anything different or something in it. Mostly just to take in the nice scene, it was different and made her feel like she was in a castle, even though she was, this felt like a PRINCESS castle, and clearly there's a difference.