Describe symbolism in Seascape by Edward Albee

The most obvious symbols are the lizard characters, Leslie and Sarah.
Because these are anthropomorphic creatures (that is, animals with human qualities), they can be used to illustrate Albee's ideas about humans and their relationships. Leslie and Sarah represent many things, including a literal depiction of evolution and progress and an Ideal of a relationship that works in stark contrast to Nancy and Charlie's relationship.