The world does not exist as a fixed, albeit changeable, entity. It is a form with a specific structure, a framework that is never filled in a single way. This framework does not understand itself. Its prerequisites include individuality and selfhood (that something is itself, in its own person). These prerequisites depend on events that may also not occur. The layers of the given and the constructed in the structure of the world are carefully distinguished. With realism, constructive idealism is also resolved. The chapters of the book: Realism and Idealism, what does it mean: "Is there?", Factuality, Objectivity, Individuality, World, Refutation of Realism and Idealism, Inner World and Outer World, Epistemological Explicationism, Given and Construction.