Subjectivism is a philosophical tenet that accords primacy to subjective experiences as fundament of all measure and law. In an extreme form, it may hold that the nature and existence of every object depends only on someone's subjective awareness of it. For example, Wittgenstein wrote in Tractatus Logico-Philosophicus: "The subject doesn't belong to the world, but it is a limit of the world" (proposition 5.632).