How are the castes distinguished from each other? What is their purpose?
The castes are distinguished from each other by size, intelligence, appearance, the color of clothing they wear and the jobs they are assigned to as adults.
Alphas = tall, beautiful, intelligent an wear grey clothing
Betas = Not as tall, but still pretty good looking and intelligent. They wear white clothing.
Deltas = average height and looks, not as intelligent and wear khakis.
Gammas = "Gammas are stupid. They all wear green. . ." (31).
Epsilons = "They're too stupid to be able to read or write. Besides they wear black, which is such a beastly coulour" (30).
The purpose of this class system is to keep everyone under control mentally and physically. People at the bottom of the classes are brain-washed to believe they are at the bottom for a good reason and to accept it. This keeps everyone in his or her own place in society in order for everyone to be happy; therefore, if everyone is happy, then no one will fight and be unhappy (thereby averting things like war).