Ezekiel 10:15-17

Then Ezekiel saw these same cherubim, which he had seen in his vision by the river Chebar, rise up. As they moved, the wheels beside them stayed right with them. Likewise when they stood still the wheels also stood still beside them. The spirit of the cherubim extended to the wheels so that whatever one did the other did. Perhaps the mobility of these creatures to do whatever God commanded them to do is what the wheels represent.