Let’s use the term legal facts for facts about the content of the law, for example, the fact that, in California, contracts for the sale of land are not valid unless in writing.[33] Legal facts are not among the most basic facts of the universe. They are determined by metaphysically more basic facts, such as facts about what various people and institutions have said and done and decided and, on some views, moral or other normative facts. A theory of law is an account of how the more basic, determining facts determine the legal facts.[34] Different theories of law make different claims about what the determining facts are and how they combine to determine the legal facts.