Imagine you pointed your camera at a book, it recognizes it, and then you can see all of the recent notes and threads that people posted about it.

Generic comments allow you to create nostr threads on physical things and places. You get nextdoor for free. You put on AR glasses and see nostr threads on buildings and places. The applications are limitless. nostr:note1x876pm98ll99kp5xjx3rwz8qqv9hgtgdd8h6nkf7mzp7rf9eez3shpcscs