Skybreaker symbolic object?

Give me one object, doesn't have to be an object in the book. An object that represents themes, reveals character trais, advance the plot, or add suspense, humour, irony, or foreshadowing in the book Skybreaker by kenneth oppel
Skybreaker symbolic object?
i forget the main character in that book, but it was good. Some blimp in the sky and they go find it. I would use rope. It symbolizes how the guy went from a navigator to a famous guy who get gold of the blimp. And that girl with the preserved creatures