It was a small room, built in the center of the wide back wall of the lab.

The floor stretched smooth and unbroken toward the distant back wall.

How quickly can you get a metal semitrailer to park by that stretch of your back wall?

She gave him a savage push, and he vanished over the open back wall.

The high back wall served as a giant projection screen for visuals.

He established that the windows were not in the front but in a dreary back wall.

First there was a wide ditch that sloped gradually down until it met the perpendicular back wall.

The entire back "wall" of my office is, in fact, a window, one which looks out over the building's central atrium.

The whole back wall behind the altar slides away and you're looking right into the biggest stereo tank ever built.

Where your back wall is, over on the other side, where there's nothing but forest.