Repos of the 22nd Century
Thanks to Judd Karlman, Brad Murray, JB Bell, James Elder, and Cam Banks for pitching the initial ideas for this experiment on Twitter! I wound up taking Judd's suggestion most directly because it's related to a game I've been chewing on for a good while and I could see how all the pieces fit. 

I think I'll be doing stuff like this again in the future: asking for specification for the design of an alien or spacecraft or anything else that implies a complex social, economic, or or ecology around it, then running with it!