ファウンデーションシリーズ
Imagined societies may be based on very different assumptions. Often the future is modeled on historic forms - feudalism, or in the case of The Foundation series, the Roman Empire. A common theme is the integration of humanity into some greater interstellar society. A popular modern example is the "Uplift" series by David Brin where a species' status is defined based on the concept of biologically uplifting other species.