 We may, then, distinguish between Humean facts and functorial facts. With the help of this distinction, two philosophical options can be formulated. One may think that there are facts in the functorial sense of the word which are contingent—the fact that Sam is sad—and facts in the functorial sense which are not contingent—the fact that \(2 + 2 = 4\). Or one may think that all facts in the functorial sense are contingent, are Humean matters of fact. The latter option is expounded in the influential philosophy of facts to be found in Wittgenstein’s Tractatus (1921). Wittgenstein there announces that the world is the totality of facts and that every fact is contingent (Wittgenstein TLP: 1.1).