How does the author use symbolism in the novel, Unbreakable?

One example of symbolism can be found in the author's use of birds, which symbolize hope as well as calamity. This dual nature is an important clue to the reader about the nature of the Legionnaires. First, there is the mention of the swallow, which is in a drawing that Kennedy first sketches. The swallow is both beautiful and fearful, peaceful and horrendous. There are also the various mentions of the doves. First they are a sign of pure intent, but then the black doves (considered rare) are also a sign of a curse. Then, later, there is the mention of a stuffed dove representing a duplicity, a fake representation of the real thing.