This is a dense and throughtful book that deftly combines theory and practice.
This is in not "architecture porn." The text is the engine here and the illustrations, well...they illustrate the ideas being put forward. The ideas grappled with center around the timeless principles of how light affects architecture -- specifically how light affects experience, how light reveals form, how light shapes space, and even "light revealing meaning." (I raised my eyebrow at that last one, but after considering the book's examples of theatrical light, festive light, contemplative light, and divine light, I got on board!)
Most welcome are four focused sections of the book that consider, for 7 to 12 pages, the interaction between light and architecture of a single building. My favorite of these is Aalto's Mount Angel Abbey Library.
Book nitty-gritty: glossy pictorial boards with a sewn binding; 181 pp. Released without dustjacket. Something like 350 illustrations, most of them in color: mostly color photos with floorplans, elevations, and some sketches. Indexed. Bibliographic and (some) narrative End Notes.