How does Franz Kafka use imagery in The Castle?

Imagery:

"Keeping his eyes fixed upon the Castle, K. went ahead, nothing else mattered to him. But as he came closer he was disappointed in the Castle, it was only a rather miserable little tower pieced together from village houses, distinctive only because everything was perhaps built out of stone, but the paint had long since flaked off, and the stone seemed to be crumbling."

"Because of Schwarzer the full attention of the authorities had focused on K. right away in that first hour, rather absurdly so, for he was then a complete stranger in the village, without acquaintances, without a refuge, exhausted after the long walk, lying utterly helpless on the straw mattress, at the mercy of each official intervention. Had it only been one night later, everything would have happened differently, smoothly, virtually out of sight."