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Orion’s Arm (also called the Orion’s Arm Universe Project OAUP or simply OA) is a multi-authored online science fiction world-building project first established in 2000 by M. Alan Kazlev Donna Malcolm Hirsekorn Bernd Helfert and Anders Sandberg and further co-authored by many people since. It was described by Cory Doctorow as a pretty thoroughgoing post-Singularity thinggum with lots of opportunity for fun noodling.