Higher and higher it rose, closing over their heads in a grey dome.

Wisps of black hair hung out from under the gray dome of the novelist's helmet.

Perched atop the old volcano was the low gray dome of the central processing facility, the first stop for new arrivals to the prison world.

One bald tor rose from a ridge on their left; to the right were two more barren gray domes.

Lightning flashed again, and still he saw nothing, as though they were under a gray dome on a sparkling, uneven floor.

They saw only a small, non-human figure in the middle of the huge gray dome.

The landscape behind them had been reduced to dim outlines and a blank gray dome of sky.

The mist clung to the outer ring, and rose up over the dip to form a grey dome.

The line snapped and leaped into the air to disappear in the gray dome above.

The library stood between a building with a grey dome and one with a façade that had once been plastered.