Can anyone explain to me what this is all about?

...And every one had four faces, and every one had four wings. 7 And their feet were straight feet; and the sole of their feet was like the sole of a calf's foot: and they sparkled like the colour of burnished brass. 8 And they had the hands of a man under their wings on their four sides; and they four had their faces and their wings. 9 Their wings were joined one to another; they turned not when they went; they went every one straight forward. 10 As for the likeness of their faces, they four had the face of a man, and the face of a lion, on the right side: and they four had the face of an ox on the left side; they four also had the face of an eagle. 11 Thus were their faces: and their wings were stretched upward; two wings of every one were joined one to another, and two covered their bodies....

http://kingjbible.com/ezekiel/1.htm