Where is juxtaposition in anthem by ayn rand?

Where is juxtaposition in anthem by ayn rand?
You need to expand the question in order for it to be answerable.

Since "juxtaposition" is the contrasting of two different things, the question needs to be rephrased with those two things in it, like this: "What is an example of juxtaposition between ___ and ___ in the novel Anthem by Ayn Rand?"