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The 30 hobbies closest to inventing languages in what you actually do and how it feels. Each one says what's alike and what's different.
Studying flags and their history, and designing your own from simple rules.
Alike: Both relaxing and creative.
Different: More competitive.
The closest are Vexillology, Genealogy, Local history, Sign language and Learning a language. They're alike in what you do and how it feels.
Local history is close to inventing languages and quicker to pick up.