'Shape' in the Bible

The shape of an expanse, with a gleam like awe-inspiring crystal, was spread out over the heads of the living creatures.

The shape of a throne with the appearance of sapphire stone was above the expanse. There was a form with the appearance of a human on the throne high above.

Then I looked, and there above the expanse over the heads of the cherubim was something like sapphire stone resembling the shape of a throne that appeared above them.