 If you liked
Kino no Tabi: The Beautiful World
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 ...then you might like
Chi. Chikyuu no Undou ni Tsuite
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There's a similar philosophical vein in Kino no Tabi as in Orb, and there's in many ways a similar atmosphere with different settings, people and cities. There's also a similarly laidback pace coupled with very serious topics which creates a quite different and interesting watching experience.