What are some or one descriptive prose used the story? Why is it a good example of descriptive prose..?

A convict's thoughts are no freer than he is: they come back to the same place, worry over the same thing continually. Ch 4

 I like the personification of "thoughts" here. There is a continual and habitual tone here to not only a convict's physical presence but his conscious presence as well: both are trapped as if on a treadmill that never stops.