The crystal-like expanse

22And above the heads of the living creatures there was the likeness of an expanse, like the appearance of awe-inspiring ice, stretched out above their heads from above.

23And under the expanse their wings were straight, each one toward her sister. Each had two covering them, and each had two covering their bodies.

24And I heard the sound of their wings, like the sound of many waters, like the sound of the Almighty when they went, a sound of tumult like the sound of an army camp. When they stood still, they lowered their wings.

25And there was a sound from above the expanse that was over their heads; when they stood still, they let down their wings.