These four categories are pretty broad, and there would naturally be subcategories and other complexities. But overall, I think the four are a good starting point for thinking about the nature of society in an absurd universe.
Beauty can be absurd too, I think, in that a beautiful thing isn't self-justifying. We can be mystified as to why something is beautiful or ugly.
The fourth category, in which I probably belong is full of various subcategories, including everything from suicides to starving artists, philosophers, comedians, and mad prophets. I go into more detail in other articles on the intellectual class.