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All of this comes to pass until, at the end of the specified time, Nebuchadnezzar acknowledges that "heaven rules" and his kingdom and sanity are restored.
The division is reinforced by the chiastic arrangement of the Aramaic chapters (see below), and by a chronological progression in chapters 1–6 from Babylonian to Median rule, and from Babylonian to Persian rule in chapters 7–12.
Daniel receives an explanatory vision from God: Nebuchadnezzar had seen an enormous statue with a head of gold, breast and arms of silver, belly and thighs of bronze, legs of iron, and feet of mixed iron and clay, then saw the statue destroyed by a rock that turned into a mountain filling the whole earth.
Daniel explains the dream to the king: the statue symbolized four successive kingdoms, starting with Nebuchadnezzar, all of which would be crushed by God's kingdom, which would endure forever.
Various suggestions have been made by scholars to explain the fact that the genre division does not coincide with the other two, but it appears that the language division and concentric structure of chapters 2–6 are artificial literary devices designed to bind the two halves of the book together.
There is a clear chiasm (a concentric literary structure in which the main point of a passage is placed in the centre and framed by parallel elements on either side in "ABBA" fashion) in the chapter arrangement of the Aramaic section.