The author uses the zoo to symbolize the cages in which all living creatures must exist to some degree. The zoo animals are kept on display for the entertainment and amusement of people even though it is a completely unnatural environment for them. People too are caged by circumstances beyond their control as in the case of the two sisters who are forced to live in a loveless household when they are orphaned at early ages. The sisters, just like the zoo animals, are forced to rely on the care of others who have no real love for them or their well-being. The author draws a comparison between the blind polar bear and Mr. Murphy as wounded creatures that are mostly gentle until they are attacked in some way. Clearly Mr. Murphy had a tremendous impact on the sisters who still remember him easily many...