contradiction? A paradox? No. It is the Law of Gravity which causes the density and pressure of a planet's atmosphere to decrease with altitude, and that decrease in pressure forces the balloon upwards until the balance point between atmospheric density and the internal density of the balloon is reached. The illustration may seem obvious and elementary to the modern man, but it seems so only because he understands, at least to some extent, the laws involved. It was not obvious to even the most learned man of, say, the Thirteenth Century. Slavery, too, has its laws, and it is as dangerous to defy the laws of a society as it is to defy those of nature, and the only way to escape the punishment resulting from those laws is to find the loopholes. One of the most basic laws of any society is so basic that it is never, ever written down. And that law, like all basic laws, is so simple in expression and so obvious in application that any man above the moron level has an intuitive grasp of it. It is the first law one learns as a child. Thou shall not suffer thyself to be caught. The unthinking man believes that this basic law can be applied by breaking the laws of his society in secret. What he fails to see is that such lawbreaking requires such a fantastic network of lies, subterfuges, evasions, and chicanery that the structure itself eventually breaks down and his guilt is obvious to all. The very steps he has taken to keep from getting caught eventually become signposts that point unerringly at the lawbreaker himself. Like the loopholes in the law of gravity, the loopholes in the laws of society can not entail a defiance of the law. Only compliance with those laws will be ultimately successful. The wise man works within the framework of the law—not only the written, but the unwritten law—of his society. In a slave society, any slave who openly rebels will find that he gets squashed pretty quickly. But many a slave-owner has danced willingly to the tune of a slave who was wiser and cleverer than he, without ever knowing that the tune played was not his own. And that is the second advantage of slavery. It teaches the exceptional individual to think. When a wise, intelligent individual openly and violently breaks the laws of his society, there are two things which are almost certain: One: he knows that