Round the crystal walls ran, echoing, a whisper that I knew.

With a push off the crystal wall, Melora flew away into the shadows and was gone.

The flashing disc began to slide, slowly, across the crystal wall.

The crystal wall slowly moved to one side and disappeared into the solid rock.

Her behaviour seemed different; she walked slowly to the crystal wall and stared out steadily at the stars.

The crystal walls of the box shifted as if they were live things.

Now he was inside the crystal wall, the true aura of the city was washing against him.

After the heroes help her they find the first part for the rip-zipper behind a crystal wall.

Immediately the others were next to her, as Deanna was staring at a crystal wall.

Jellico tapped the crystal wall separating them from the ball.