Pattern #159: Light on two sides of every room

It works exactly as it sounds, Alexander argues that every room should have light coming from at least two walls. This is one I'm concerned about given the PS constraints seem to directly conflict.

One idea that the commenter on a previous post introduced was an interior atrium idea. The light still comes in from the south, but rooms beside the atrium can have W/E windows facing the atrium. They would therefore have light coming from two walls, while not exposing the house to sunlight on external W/E walls.

Major downside I imagine would be cost (the atrium requires additional walls and might end up being ineffective living space). One more idea to added to the list of possibilities.