Interests can be rabbit-holes of awesome. There’s no telling how deep they run.
One of the things I love about exploring interests is getting inspired by people who are passionate about them. Book-binding, for example—there are people who are very geeky about book-binding. Same goes for photography, sewing, gardening, and all sorts of other good things. That’s what’s great about the Internet. It’s easy to find people passionate about an interest, no matter how niche it is.