It turned out to be an opaque but glowing wall.

He ran past the building toward glowing walls of light just beyond.

The door slid open to reveal a solid glowing wall.

Despite the glowing walls the light around him was dimming.

Now it is a black rectangle in a faintly glowing wall.

They came finally to steps, rounded a corner and were brought short by a glowing wall with a dark handle visible in its center.

The world narrowed to a glowing wall and hands that she could almost feel pressed against her own.

He heard big things dragging and bumping along his glowing wall.

More than a dozen openings led away from the cave, some of them at floor level, others higher up along the glowing green walls.

He pointed to a bulge in the glowing blue wall.