An oval of light had appeared against the grey wall.

In front of the grey wall a man stood listening, waiting.

A dirty gray wall stood where moments before there had been nothing.

Against the gray walls his midnight blue seemed almost black.

Nothing and no one was keeping him on the outside of that gray wall.

"How do you think they would look on a gray wall?"

At the far end, shadows played on what seemed to be a gray wall.

To the north, she could make out a moving gray wall.

The steam was a dead, gray wall in front of his eyes.

Proceed straight ahead and stand in front of the gray wall.