Vitale da Bologna, Ezekiel's Chariot
Pomposa Abbey, Codigoro, Italy
Ezekiel 1 says the prophet was beside the river Chebar when he received this vision. The blue-green field behind the chariot may be intended to signify that river. Given the difficulty of representing all the vision's wheels and creatures and such, the artist has settled for a very simple picture of the chariot, horses, and some flames. In the vision God is in Heaven, not in the chariot.
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Photographed at the abbey by Richard Stracke, shared under Attribution-NonCommercial-ShareAlike license.