OA is set tens of thousands of years into the future, and adheres to plausible, or "hard" science-fiction; that is, no human-like aliens, no faster-than-light travel or other contradictions of the laws of physics, no Star Wars-eske space battles, et cetera. The denizens of this universe are ruled over by god-like, superintelligent artificial intelligences (AIs), called "archailects".
A computer game and card game, as well as short movies are all being developed by the community, within the OA millieu.
Orion's Arm Links