@louannwarren Next to the windows are protruding concrete slabs. They are not particularly noticeable by the frontal view, but clearly stand out from the facade surface. A single strong light source somewhere left down on the floor, close to the facade, throws the effective, diagonally running shadows across the wall surface.
Really attractive patterns of windows and shadows. I love how the light levels differ from one room to another, making me curious about who is in occupancy and why.
Thank you all for your nice comments!
The subjects and styles... it is always a challange. Sometimes I succeeds more, sometimes less.