The pictures come from the Visible Infrared Imaging Radiometer Suite (VIIRS) satellite, and have been referred to as "The Black Marble" in reference to the famous "Blue Marble" daylight pictures.
The curtainless windows were rectangles of electric-blue sky that turned to gray and then normal daylight as the patients rose and slowly, in their thin striped cotton robes, began wandering down the corridor that led into the common room.