I don't build or sell. I just take the photos, put them up on the internet and and go goof off. My job, which pays for my hobby started as a hobby which came from my job which came from my hobby, etc.
Strange story, but in the last maybe thirty years I haven't done anything for a living that didn't start off as a hobby. Don't make much, but ain't very good. Used to make money as a kid by drawing. Worked like a fool for 9 years, still liked to draw and read. Then, one day, reading turned to writing, writing turned into tech writing, drawing turned into tech illustration. Started math/geometry as a hobby, that turned into engineering backed by drafting and computer programming from there. Programming and engineering turned into geographic information systems and making games for bbs' and that into internet. Geographic information systems turned into photo-modeling building and interactive maps. Models turned into virtual models with floorplans of homes for sale and programming turned into the internet. Started taking photos of nature and buildings and turned them into community modelling. Community modelling turned into web site building and natural environment photo-models. I started learning about the environment and started taking photos (no matter what the quality

). Photos sell to books occasionally. Author told me the way I like to tell stories I heard I should write a book- use my pictures because as an author that was her biggest expense. Take all my photos and put them up on the internet (about 40-50,000 shots to date) over a variety of sites/community/environment models and sell advertising. Collect stories I've heard in the mountains and desert and visit places they took place to take photos for a book(s) I'm trying to write. All the photos, at least the good ones I like will end up in books, or the internet at the least.
So on, so forth. Very bohemian/gypsy semi-free-spirit in nature. Get to live off my creative instinct, but because of my love of the technical. No school, never cared. Can't sit long enough. Don't make much, not all that good. Don't care other than taking care of my family- to a point.
Complained to my father a few years ago about I didn't have a retirement plan. He told me once I was retired I'd just do what I do now (take photos, write), so what was my point? He thought I retired at age 24.
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BTW, one of my sites is at the end of my tagline below.