" That's a good point," Professor Hirota said. " But there is one thing we ought to keep in mind in the study of man. Namely, that a human being placed in particular circumstances has the ability and the right to do just the opposite of what the circumstances dictate. The trouble is, we have this odd habit of thinking that men and light both act according to mechanical laws, which leads to some stunning errors. We set things up to make a man angry, and he laughs. We try to make him laugh, and again he does the opposite, he gets angry. Either way, though, he's still a human being." Hirota had enlarged the scope of the problem again." Well, then, what you're saying is, no matter what a human being does in a particular set of circumstances, he is being natural," said the novelist at the far end of the table." That's it," Hirota shot back. " It seems to me that you might create any sort of character in a novel and there would be at least one person in the world just like him. We humans are simply incapable of imagining non-human actions or behavior. It's the writer's fault if we don't believe in his characters as human beings. "