Ask HN: Any interesting niche hobbies?

I love how every hobby has its inner nested hobbies and you can seemingly go infinitely deep.

I got back into making electronic music a while ago, and you can dig in deeper by getting into hardware synthesizers. And go deeper by getting into hardware modular synths. And go deeper by building modules from kits. And go deeper by learning electronics and designing your own modules.

It's like a big branching tech tree or tech graph.

With fishing, you can get into fly fishing. And when that's too easy, you start tying flies, or maybe tenkara, or, I guess in your case, making fly rods.

I love it.

https://dejabru.org - The Homebrew Competition Remembering Historic and Long-Forgotten Beer Styles

Not sure if this is an established hobby or something I've just come up with myself, but I've been "dashboarding." Essentially I have a Blazor webapp that integrates lots of data sources (some manual, some automatic) from areas of my life and I use that to visualize and analyze goals and habits. The main page consists of rolling-weekly stats that deliver "integration scores." Each score contributes to an overall score that gives me a general idea of how I'm doing on all my habits and goals.

So for instance, I use YNAB for our family budgeting, and I have it setup so that if I go a whole week without performing reconciliations, I get dinged -1. Otherwise this sits at 1.0. Then I have a score for journaling - my goal is to journal 4-5 times per week, so each time I journal it resets the score to 1, and then slowly ticks down to 0 over time. Then I have a number of Apple health scores that get imported automatically via REST API. This part compiles all the data on calories, relevant macronutrients (I mostly track protein and fiber currently), steps, workouts, etc. and builds a nice visualization. I consider a total integration score of 0.8 to be pretty good - keeping at that level is actually better than seeking for a perfect 1.0 all the time as my theory is that it will prevent burnout and allow for some forgiveness, because I can't be perfect.

It's been a fun project, and one that I generally try to avoid any AI use. Fun to just build and because the stakes are so low I just chip away at one feature at a time, carving out 15 minutes here or there.

I also take notes when I fish. It's less about recording a life list, and more about trying to collate what is otherwise very thing spotty data enough to get better at fishing.

As someone who has learned a lot of skills and hobbies online and likes sharing info, fishing has been a really interesting different world. Because anglers are effectively competing for a scarce resource, specific information about good fishing spots is understandably not shared widely.

So you have to put in the time yourself to try spots and see what produces. But in order to catch fish, you need to be at the right place, at the right time of year, at the right time of day, with the right lure, and the right technique. Get any one of those wrong and the only signal you get is "no bites". That makes it really tough to learn and improve.

I've found that taking detailed notes helps me see patterns in what works that would otherwise be hard to see.

Recreational mapmaking.

Every couple of months the family and I will book out some long weekend to just go to an Airbnb in some random town with some copy paper and just go around trying to draw what we think is around us. Inevitably the lines collide and we have to ask some local passerby for help, and if they know any interesting places nearby, and before you know it they're following along with a colored pencil and some copy paper against a hardcover book too.