With no traditional subject here, the lines, shapes, and shadows are allowed to shine in this photo. This is the second of two shots at this library, which had a lot of character.
There is an amalgamation of shapes here via the curved roof, vertical notches, square vents, and diagonal lines through the middle.
The blue sky and its contrast with the roof shadow add a graphic quality that fits well with the geometric aspects, and the light in the foreground acts as a visual anchor as a starting place for your eye.
I was really pleased with the final results of this photo.