Until this last year, this concept seemed the least likely to happen. A standard human is one that would be physically conditioned from the original state of sperm, and egg until the embryo is completely develop. One sets up a standard for each class, all citizens in that class will fit the standard mold. For example, if one was destined to work in the tropics, they would be conditioned to physically like the heat. In the novel, there are five main classes. Alpha, Beta, Gamma, Delta, and Epsilon. Alpha being the most intelligent, and individual, and Epsilon being 'semi-moronic' and common. Epsilons are often members of a bokanovskified egg. This means the egg was split up to 96 times, and each embryo is a twin to 96 others. Most Alphas, come from a single egg. Each class also has a sub class of plus or minus. Huxley is takes class structure of the 1920's and magnifies it to such detail that in the novel it almost seems absurd, but in reality, every day people are judged by their class. Each class in a Brave New World must wear a specific color. In Huxley's society that was not the case but one could easily tell by ones clothing what class they came from. Those from the world of 'Old money' looked down on people who were newly wealthy, who in turn thought themselves better than the middle-class, who in return looked down on factory workers, and so on until we have the last impoverished man in rags. Yet society did not feel class distinction was wrong. When Huxley brilliantly extrapolates what is already happening in the guise of his utopia, it seems to be absurd behavior.