“The appearance of the wheeles, and their worke was like vnto the colour of a Berill: and they foure had one likenesse, and their appearance and their worke was as it were a wheele in the middle of a wheele.”
1611 King James Version (KJV)
1:16 Work - All that was wrought, whether engraved or otherwise was of one colour. Beryl - A sea green. One likeness - The same for dimensions, colour, frame, and motion. In the middle - It is probable, the wheels were framed so as to be an exact sphere, which is easily rolled to any side.