How does Robert Jordan use imagery in Lord of Chaos?

Imagery:

"But then, people in the Two Rivers used to say nothing there ever changed, yet a great deal had since the Trollocs. Emond's Field [...] was larger than [Faile] had first seen, all the burned houses rebuilt and new going up. Some in brick, another new thing. And some with tile roofs. At the rate new dwellings were being erected, the manor would be in the village soon. There was talk of a wall, in case the Trollocs returned. Change."

On a day of fire and blood and the One Power, as prophecy had suggested, the unstained tower, broken, bent knee to the forgotten sign.