Architecture can be understood from the inside or from the outside. This is not the same as saying that architecture can be understood from the interior of buildings or from the exterior of buildings, from the rooms inside or from the street. It's a matter of attitude.
Surfaces are unreal.
If you like, consciousness, either real or implied, is the other, missing side of surface. By contrast, when we see the world from the always-inside, as an interior within an interior within an interior, we ourselves, our very consciousness, looks back at us from every visible thing. It is, rather, a dancing, transforming set of distances to and from us and of situations around us, around every person. We stand at the center of this world even as we understand fully that other people are centers too. The world, on this approach, consists entirely of umwelten, environments.