Further Studies in Impossibility

They stand on a rooftop and she draws him three mazes. They drink coffee at a street cafe she doesn't recognize. And he tells her that they're dreaming. The first thing Ariadne thinks is that it really is like a Pensieve, being dropped into the middle of someone else's world without warning. The second thing she thinks is that it's like Legilimency when it's working properly, really working and you can see inside someone's head as clearly as if you'd opened a window and peered inside.