"Downtown, amoxtli" Rigid symmetry frames the windows, but they reflect urban uproar at its least symmetrical. They also ignore their duty to show us what's inside. B/W is an excellent choice for this.
I despair of figuring out how to continue this, in spite of some excellent help from pbasers, so I'll just list my choices and my comments, and you'll need to look them up. Thus, my apologies, also. I'm a smart, grown-up, somewhat e-savvy man, but a new computer procedure requires much study and profanity before I can get it right. Herewith:
3rd place: robinlew, "Reflections off the Ara Pacis...." (top left of that entry). Mysterious and colorful; reflections and unusual views. Complex to the point that one isn't sure where the window is.
2nd place: cits_for_pets, "Pacman" image. Visually the most striking entry of all, Witty. Is the window mocking the rule of thirds, or do I just not understand what that is? Angles, illusion of depth, and a ghostly reflection.
1st place: amoxtli, "Downtown". See above; I think I got that part right!
Honorables: first, the several brilliant, colorful, reflection pieces were all spectacular.
Others I liked in no particular order:
alain_lestrade: window showing cozy indoor scene and lonely rural scene, with rural pine cone on the inside. Implies a story. B/W is the thing for this one, too.
ee66: heavily barred window centered on an ocher wall. Wonderful composition and colors. As striking as "Pacman." What's behind the window that needs all that protection?
irislynx: "winda." This window shows an eerie secret of some sort. I don't want to go indoors to find out. The whole image is wonderfully desolate and lonely. And creepy.
cits_for_pets: "Many a fly....." Yes she got 2nd place too, but this window obviously looks out on some other planet, or dimension, not on whatever is was put there to make visible.