This is my favorite composition of the lot and it really was all about composition. Me being "artsy". As soon as I looked at it I had to laugh. Placing an "empty" space right in the middle would have made my drawing teacher back in the day crazy! But I love it and I think it is because the red brick showing through doesn't seem like empty space to me at all, just a rich red line.
I like the simplicity and abstract quality to the composition as well as the color. I have to admit, it was really fun to just think in compositional terms for a bit and not deeper meaning and metaphor. But it did remind me of the warnings I've seen in London subway stations...to "Mind the Gap".
Actually, this is an excellent exercise for anyone who wants to explore design. Pick an impossibly small place and see what sorts of compositions you can come up with. Make a lot of photographs...horizontals and verticals. Get in close and go for the pure abstract expression if you want. Above all else, just have fun with the exercise and don't give a second thought to the gap.