What metaphors are used in Rich Man, Poor Man by Irwin Shaw?

There is the metaphor of brotherhood through the narrative. A major plot line within the novel is dependent on the relationship between Rudolph and his brother, Thomas. Thomas has always believed himself to be less than Rudolph; loved less and less able to achieve greatness. Due to this burden, Thomas often finds himself in situations of scandal for which he has no regret because he thinks no one would expect anything more of him. However, Thomas will eventually grow enough within himself to figure out that he is hurting no one but himself with his attitudes and beliefs. It is only at this point that Thomas will begin to change.