The theme of the story is developed by the two main characters based on how they interacted and thought.
The characters had been cellmates at one point, but now they both were in a prison camp, and one was living in moderate comfort, while the other was laboring in the mines.
The difference in their material possessions and positions in the prison camp is shown by how they act, and what they wear, and their desires.
The cellmate who worked in the office wore good shoes and checkered socks, which are pointed out because the other man only had rags to cover his feet, and how the miner wanted what the office man had, but he knew the difference in their statuses.
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