Ezekiel 1:5, 22, 26

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

Now stretched over the heads of the living beings there was something like an expanse, looking like the terrible and awesome shimmer of icy crystal.

Now above the expanse that was over their heads there was something resembling a throne, it appeared like [it was made of] sapphire or lapis lazuli; and [seated] on that which looked like a throne, high up, was a figure with the appearance of a man. [Phil 2:5-8]