What is the fine-grained topic of the following text: As I stood there, waiting for my green tea latte, pondered what my MacGuffin could possibly be, taking a mental inventory of all the things I've let pass through my hands, and things in my house (as opposed to inventory in the store) that I'm particularly fond of, things that I really wouldn't part with. Only return the topic.
Reflection on personal possessions and their significance