²² Over the heads of the living creatures, there was what appeared to be a firmament, glittering like crystal and spread out over their heads. ²³ Beneath the firmament, their wings were stretched out straight, one toward another, and each of the creatures had two wings covering its body. ²⁴ I also heard the sound of their wings, like the roar of mighty waters, like the thunder of the Almighty. When they moved, the sound was like the noise emanating from an armed camp. And when they stood still, they lowered their wings.^[a]