In 1911, the German philosopher Wilhelm Dilthey published an essay entitled "The Types of Worldview (Weltanschauung) and their Development in Metaphysics" that became quite influential. Dilthey characterized worldviews as providing a perspective on life that encompasses the cognitive, evaluative, and volitional aspects of human experience. Although worldviews have always been expressed in literature and religion, philosophers have attempted to give them conceptual definition in their metaphysical systems. On that basis, Dilthey found it possible to distinguish three general recurring types of worldview. The first of these he called naturalism because it gives priority to the perceptual and experimental determination of what is and allows contingency to influence how we evaluate and respond to reality. Naturalism can be found in Democritus, Hobbes, Hume and many other modern philosophers. The second type of worldview is called the idealism of freedom and is represented by Plato, Descartes, Kant, and Bergson among others. It is dualistic and gives primacy to the freedom of the will. The organizational order of our world is structured by our mind and the will to know. The third type is called objective idealism and Dilthey sees it in Heraclitus, Parmenides, Spinoza, Leibniz and Hegel. In objective idealism the ideal does not hover above what is actual but inheres in it. This third type of worldview is ultimately monistic and seeks to discern the inner coherence and harmony among all things. Dilthey thought it is impossible to come up with a universally valid metaphysical or systematic formulation of any of these worldviews, but regarded them as useful schema for his own more reflective kind of life philosophy. See Makkreel and Rodi, Wilhelm Dilthey, Selected Works, volume 6, 2019.