All the posts have been extremely helpful. Thanks!
As for #2, what do you mean by processional litter?
Okay…
In Exodus 25:17-20 we read:
And you shall make a kapporet of pure gold: two cubits and a half its length, and a cubit and a half its breadth; and you shall make two kheruvim of gold, of beaten work you shall make them at the two ends of the kapporet; and make one kheruv at the end on this side, and one kheruv at the end on that; from the kapporet you shall make the kheruvim on its two ends. And the kheruvim shall stretch out their wings upward, overshadowing the kapporet with their wings, and their faces shall be ‘a man to his brother’ - towards the kapporet the faces of the kheruvim shall be.
You would note that on this lid (traditionally rendered in a loose fashion as ‘mercy-seat’) are two cherubim of gold. God then tells Moses:
And I will meet with you there, and I will speak with you
from above the kapporet, from between the two kheruvim that are on the chest of the testimony, all that I will command you for the sons of Israel.
Indeed there are quite a number of references to God riding/sitting on a cherub in the Bible.
So the people sent to Shiloh, and brought from there the chest of the covenant of YHWH Tzevaot, sitter of the kheruvim; and the two sons of Eli were there with the chest of the covenant of Elohim, Hophni and Phinehas. (1 Sam. 4:4)
And He rode a kheruv and flew, and glided on the wings of the wind. (Ps. 18:10; cf. 2 Sam. 22:11)
O YHWH Tzevaot, God of Israel, sitter of the kheruvim, you are the God, you alone, of all the kingdoms of the earth; you have made the heavens and the earth. (Is. 37:16)
Now, in Ancient Near Eastern cultures, winged creatures, sometimes portrayed as human-animal hybrids, are considered as protectors and representative/intercessors. They were the guardians of sacred precincts, persons and objects from intruders and the bringers of the petitions of man to the gods. In fact, they are commonly seen to flank thrones; they serve as the seat or vehicle of the king or the gods:
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Please Note: This uploaded content is no longer available.)
http://www.bu.edu/anep/BethShanthrone.gif
http://worldreligion.nielsonpi.com/media/godridesuponacherub.jpg
In Egypt, meanwhile, there are box-shaped portable thrones, designed to serve as the Pharaoh’s or a god’s processional chair.
http://img101.imageshack.us/img101/1535/arkthroneegyptian.jpg
http://img101.imageshack.us/img101/5562/mvc140s.jpg
Note the winged creatures overshadowing the seated pharaoh.
The Ark was probably functionally similar to these: it was a portable (empty) throne and footstool for God, some sort of symbol for His presence or something along those lines.