The most noticeable is that the color of the finish of the steel cladding of the building varies between aqua and lavender, depending on the angle between the viewer and the surface of the building, as in the following shots.
The second unusual aspect is that the building features rows of windows that spell out in Morse code the library's name: Appaloosa Library.
I didn't confirm this; I am taking their word for it. Here is a view of some of the windows from the interior. Just a bit weird.
The other feature of interest in the interior was the ceiling ductwork.
One may debate the wisdom of ceiling's "unfinished" look, but at least it makes for interesting abstracts.