Describe symbolism in Ship Breaker by Paolo Bacigalupi

Tattoos are a symbol of identity. Tattoos, which identify human beings as belonging to specific crews and give them the right to salvage on Bright Sands Beach, are worn on the cheeks by Nailer, Pima, Sadna, and others. Tattoos are also used to enhance one’s fearsome persona, as in the case of Richard Lopez and his dragon tattoos.