"It is a way to magically close your mind. It helps organize your memories and protects you from Legilimency. Mind reading. It’s an ancient technique that has been around for a long time. It is a very interesting technique. I’ve been Occlumens since third year." They both stared at me like owls. This happened quite often. Sighing, I added, "just think about it, will you? Especially telling Dumbledore what is going on."