The appearance of the wheels and their workings was like the color of beryl, and all four had the same likeness. The appearance of their workings was, as it were, a wheel in the middle of a wheel.
Ezekiel 1:16
Surrounding context
1:15 Now as I looked at the living creatures, behold, a wheel was on the earth beside each living creature with its four faces.
1:16 The appearance of the wheels and their workings was like the color of beryl, and all four had the same likeness. The appearance of their workings was, as it were, a wheel in the middle of a wheel.
1:17 When they moved, they went toward any one of four directions; they did not turn aside when they went.