  In his Habilitationscrhift, Essentiale Fragen (Essential Questions) from 1925 Ingarden “paves the way for his future metaphysics of the world”, such as he later develops in The Controversy over the Existence of the World (de Santis 2015). In Essential Questions, the focus is on different ways in which one may ask questions about essences. Ingarden assumes (as was characteristic in the phenomenological tradition) that there is a correlation between types of judgment and entities judged about. He thus uses the differences in the sorts of judgments that would answer the various questions as the basis for distinguishing different categories of Ideas. (For further discussion, see de Santis 2015, Ryle 1927). 