An upright section of the bookcase swung into the room.
A moment later, a small section of the nearby wall swung open.
A small, low section of the stone wall swung outwards.
Abruptly they started as a great section in the wall swung outward.
The next instant both boys gasped as a section of the wall swung open!
At once a section of the floor detached and swung downward.
One section swung inward, to the right; the next came outward, to the left.
When she lifted it and applied pressure, the section swung open.
A moment later, he heard another whistle, and a section of the fence swung open.
Something snapped, and a section of the wall swung in.
