A wall of nothing, with his back pressed against it.

Like the walls of reality were pressing in?

High walls pressed close on either side, and ahead was a blank windowless mass of stone.

The walls of the cave pressed in on her senses.

I was lying at full length; hard walls were pressing against my ribs.

The luminous green walls of the boundary pressed in to each side.

These thugs knew the trick to it; they found the catch, and the wall pressed aside.

The walls of the ravine pressed in so close they seemed almost to meet over my head.

The wall of bodies was pressing close now.

"Light," he said, the walls of the tunnel pressing against his shoulders and back.