In the novel "Piggy's," the glasses symbolize intellectualism. Piggy is the owner of the glasses and he represents the rational and scientific thinking that the other boys lack. The glasses are used to start the fire on the island, which is a symbol of hope for rescue. They are also a symbol of the boys' ability to make fire and thus their ability to survive on the island. As the story progresses, the glasses become a target for destruction, representing the decline of rational thinking and the rise of savagery and chaos.