There's this scene in "The Night of the Hunter" when the...

There's this scene in "The Night of the Hunter" when the kids are downstairs, and you have the feeling that they're both in a room and at the same time it looks remote. And you wonder, How can you give the effect of both "inside" and "outside" at the same time. And you realize, by watching it many times, that around the scene there's this black edging.