The wall to the right of their original entrance opened.

Then the wall slowly opened away from him, and he was facing the stars.

The magnetic wall opened for a moment, and the ship shot through.

The wall opened, as before, with a tearing sound right in front of her.

High above, where the walls opened upon sky, some- thing moved.

Then the wall of the mountain opened and there was a large cave.

The wall moved under his hands and a small door opened.

Then the walls opened to a space, and there was the scent of a woman.

Suddenly, the wall on the opposite side of the room opened.

The wall didn't open when he drew up to it.