It is a violation of the Law of Thelema to abuse the natural qualities of any animal or object by diverting it from its proper function, as determined by consideration of its history and structure. Thus, to train children to perform mental operations, or to practice tasks, for which they are unfitted, is a crime against nature. Similarly, to build houses of rotten material, to adulterate food, to destroy forests, etc., etc., is to offend.