Answer:
The author's choice of words presents a contrast between the buildings, greenery, and other things Klaus had seen earlier swallowed up by the sour-smelling cement and the snarling barbed wire.
The references to the wall becoming an "oppressor" and it association with fear, suspicion, and the government also help to visualize the setting.
The author describes East Berlin as being "colorless" compared to the West Germany, in the glimpse the reader is given of what Inge sees through the hole in the wall.
Step-by-step explanation: