In this fantastic story, the author Franz Kafka uses the metamorphosis to depict how he sees society. Throughout the story, he makes one see society through Gregor's eyes. Kafka portrays society as being fickle and a close-minded one. The purpose in this story, like all fantastic stories, is told at a deeper level. Gregor, due to his situation with work and his family, was slowly changing into a monster and he did not even know it.
People do change over time due to the circumstances of their life.
After someone accepts what he or she have become, that someone and his or her family must deal with it. The rest of the story depicts one's life after this turning point. Like in all fantastic literature, the relationship between the magical element and the rest of the world causes a huge problem. The world as the characters know it does a 180 degree turn around that Rabkin mentions. The family was completely dependent on Gregor before the metamorphosis.