Some people play video games in their free time; others like to exercise or read. My hobby is organization. I put things away. I’m not one of those poor souls who is paralyzed by the presence of a speck of dust on the floor. I don’t wash my hands until they are raw. I grasp handrails on the El without hesitation. But I sort and I categorize and I de-clutter. I have a platonic idea of where things belong, and spend an inordinate amount of time making sure they stay there.