'Living Creatures' in the Bible

Within it there were figures resembling four living beings. And this was their appearance: they had human form.

Among the living beings there was something that looked like burning coals of fire, like torches moving back and forth among the living beings. The fire was bright, and lightning was flashing from the fire.

And the living beings moved rapidly back and forth like flashes of lightning.

Now as I looked at the living beings, I saw one wheel on the ground beside the living beings, for each of the four of them.

Whenever the living beings moved, the wheels moved with them; and when the living beings rose from the earth, the wheels rose also.

Wherever the spirit went, the beings went in that direction. And the wheels rose along with them; for the spirit or life of the living beings was in the wheels.

And then I heard the sound of the wings of the living beings as they touched one another and [I heard] the sound of the wheels beside them, a great rushing sound.