Of all the philosophical problems crowding my mind, four are recurrent and pressing. They are like two roundabouts to which I return regularly, inevitably. If I let my mind wander, there I am, thinking about one of them. I hear them silently, like earworms that take turns, melodies stuck in my head. Let me tell you about two of them (the other two will have to wait for another note). One is about the nature of reality. What comes first, things or relations? Not chronologically, of course, but in terms of ontological priority. We cannot help but perceive and conceptualise the world in terms of stuff. We are stuff. We are surrounded by stuff. We eat stuff and bump into stuff. Stuff does stuff, causally. Stuff is made of more stuff, it changes, moves, grows and shrinks, is gathered, modelled, built and broken. Stuff everywhere, every time. Anything else is what happens to stuff. Properties, transformations, relations. From Aristotle onwards, the problem of Being is the problem of stuff: s...