That's One Small Step for Man

In Chapter 8 of Slaughterhouse-Five, Kurt Vonnegut develops a cliche about how Dresden had transformed into the moon after the bombing. Vonnegut is able to portray an image of a barren wasteland to the reader where everything that once was there, only used to be there. In the quote, "Dresden was like the moon now, nothing but minerals. The stones were hot. Everybody else in the neighborhood was dead" (178), Vonnegut first introduces his comparison between Dresden and the moon. As a reader, I instantly thought, "Wow" because it made me realize just how severe the damage truly was. Vonnegut is able to transform this experience that few people could relate or connect to into an experience that everyone can connect to. Everyone on Earth can relate to a simile of the moon because everyone on Earth has seen the moon and knows what it looks like. With this first simile, Vonnegut is able to grab the reader's attention and explain symbolically what it was like.
But he wasn't done there.
What makes this simile a cliche are Vonnegut's repetitive references to his original simile of "Dresden was like the moon." For the next few pages, Vonnegut's effort of focusing on his simile becomes cliche, or a dead simile (which isn't technically on the literary terms sheet, but I made it up because it isn't quite a dead metaphor).
For example,

• On page 179, when Billy is describing the bombing of Dresden to Montana Wildhack, he says, "'It was like the moon.'" Vonnegut's first directly refers to the original simile. ("Dresden was like the moon.")
• Later, on the same page and into the next one (180), Vonnegut describes the reaction to the bombing as, "It was realized then that there was no food or water, and that the survivors, if they were going to survive, were going to have to climb over curve after curve on the face of the moon." Here, Vonnegut is describing the rocky surface of the remains of the town. In this way, he is abstractly comparing Dresden to the craters of the moon. This could be seen as an extended or implied metaphor.
• In the next sentence, Vonnegut says, "The curves were smooth only when seen from a distance" (180). Just like, say, the moon, perhaps?
• In the following paragraph, Vonnegut includes two references to the moon with "Nobody talked much as the expedition crossed the moon." (180) and "There were to be no moon men at all" (180). The latter of these references is also an extended/implied metaphor that these survivors are now akin to moon men.

Therefore, Vonnegut's original simile comparing Dresden to the moon has grown tired and cliche. The spontaneity is now gone, and the effect of the initial simile is now ineffective. With Vonnegut's repetetive comparison to the moon, the reader is no longer thinking "Wow" and is now thinking "Okay, I get it. Dresden is the moon. It's been established." Vonnegut's original simile was excellent, but by the end of the chapter, the comparison has been over-emphasized.