Ezekiel 10:9 TLB

[9] Each of the four Guardian Angels had a wheel beside him-"The Whirl-Wheels," as I heard them called, for each one had a second wheel crosswise within-sparkling like chrysolite, giving off a greenish yellow glow. Because of the construction of these wheels, the Angels could go straight forward in each of four directions; they did not turn when they changed direction but could go in any of the four ways their faces looked. Each of the four wheels was covered with eyes, including the rims and spokes.