The Piper's Gallery

"We're not the sort of thing that's meant to be seen... especially by little girls who are troubled enough by their thoughts at night. We are, all of us, imperfect in a way... we should not be seen or heard. But we are safe here at Hogwarts. At Hogwarts we can do no harm."

"She knew where she was going. The girls' washroom was down one flight of stairs and around the corner, but that wasn’t where she was now. She caught her breath as if she’d just plunged head first into frosty ice water. She was standing in front of the door to Piper’s Gallery."