The most wonderful in a room is the light that comes through the window of the room. The sun never knew how great it was before a room was built - Louis Khan
Paradoxical to the closed façade (which I really love, such a bold statement!), the house really embraces natural light.
Through the careful placement of windows and walls, each floor and room has its own light intensity: very light on the ground floor, slightly darker on the first and second floor, and again bathing in light on the top floor.
Almost a shame to add furniture!