December Wallpaper - Concrete

After two natural image sets, for December I am going in the opposite direction - concrete tubes under the ground.

Although, perhaps they are not as different as they first appear. Detailed repetition and long curves continue to be the things that appeal to me most about the wallpaper images in our collection so far.

I also love that one of the images is in black and white while the other is in full color, though you may initially see this as a monochrome set.