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Originally Posted by (E)
Are there precursor artifacts? If so what are some examples.
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Yes, the galaxy has been able to host sentient life for a long time at least on a civilizational scale.
Prominent examples include:
The 'Useless', an apparently solid hemisphere of granite about 1.5 meters in diameter marked with complex deeply incised patterns. When activated by a hidden control on its surface the object emits a steady hum at the lower end of human hearing and apparently achieves nothing else. While this device of unknown origin and questionable provenance probably should have been written off as a hoax long ago it remains notable for the number of anecdotal reports of often disturbing religious visions amongst people repeatedly exposed to it.
'Rhine-Abas' Jars, named for the xenoarcheologists who first described them these are simple, apparently ornamental, vessels produced by a now long extinct non-space fairing society on a world subsequently colonised by humans. At the end of the day they are just small oddly shaped metal jars fashioned from a variety of otherwise industrial metals, primarily titanium, using a number of non-standard but not particularly advanced metalworking techniques. They are sought after by art human collectors because they are comparatively rare and fairly attractive in a bulbous sort of fashion.
Question
Are there significant multi-species communities? If so how common are they?