Hobbies have no limit to variety. It's a regular, thematically-linked set of activities, often towards something productive, but which places nearly all the emp

Hobbies have no limit to variety. It's a regular, thematically-linked set of activities, often towards something productive, but which places nearly all the emphasis on the process. If it is too general, then narrow it down. Programming. -> Code golfing. -> Find the optimal implementation of X on processor Y. Program [classic machine] -- on pen and paper to get rid of all the distractions. I suppose the original Sudoku counts too. Amateur radio. -> Amateur satellite antennas -> bounce your signal off the Moon. Many sorts of nature activity. Hiking. Boating -> Kayaking -> white water rafting. Hm, an apiary would be safer. Visual arts. Drawing. Calligraphy. Painting. -> Painting using pointillism. -> Painting using only dice arranged in a rectangle with the 1 - 6 being the shades of grey. Something involving food. Brewing. Pastries? There are small skills. Often related collections. This may be a kind of "collecting" hobby where being able to do it well, is to "have" that in your collection. English regional accents. Juggling (with tricks especially). Dances which seemingly defy gravity or friction. The variety of things people can apparently do with a yoyo. Learning arithmetic or party tricks of that nature, generally. This becomes entertainer's magic easily.