I recently added three new sub-categories under Philosophy. I have now changed two of them, Personalism and Value-Centered Historicism, into sub-categories of the third new sub-category, Idealism, thus making them third-level categories. In this way, my understanding of the relation between personalism and idealism and between value-centered historicism and idealism, or my understanding of personalism and value-centered historicism as idealistic and as versions of idealism, is clearly reflected in the organization of the categories and immediately seen in the way they are displayed in the sidebar.
Jan Olof Bengtsson 