ravenest
The Chariot image is derived from the description of the Merkaba (the chariot-throne of God) in Ezekiel, Chapter 1. It's kind of confusing but worth a read (or two or three or four ) if you have a Bible handy. It almost reads like a description of a sci-fi space ship of some sort. When it moves, it always faces in the same direction, as if it's some kind of gyroscope (which is further suggested by the configuration of wheels within wheels).
http://www.tarotforum.net/showthread.php?t=124078
Part 2.