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The 30 hobbies closest to sign language in what you actually do and how it feels. Each one says what's alike and what's different.
Learn a new language through apps, classes and conversation exchange meetups.
Alike: Both brainy and rhythmic.
Different: Less hands-on.
The closest are Learning a language, Inventing languages, Genealogy, Local history and Archaeology digs. They're alike in what you do and how it feels.
Local history is close to sign language and quicker to pick up.