For experts/enthusiasts of Japan: Arts, media, clothing, customs, manners, social interaction, administrativia, visas, education, work.
Covered by other QAs: language, anime, manga, cooking, travel.
For students, teachers and linguists covering all aspects of the Lojban language from grammar to word usage.
Lojban is a machine-parsable, constructed spoken language with a community of around two thousand people.