"It’s like this, Min," Enola began, nibbling on a peanut cookie. "When we created Harry’s mindscape each plain was designed like a stage. It had rules, parameters ... we knew what each one would look like. But whatever this thing is in your mind, it’s just there. It will be a blank space, light or dark, and we have no way of knowing if it has anything else or not. And on top of that, it's showing Harry bad memories, possibly the ones Ron is trying to stir in you to keep you feeling worthless and beaten. That might be enough to drive Harry mad after too long."