From the ArcaMax Publishing, Vocabulary Newsletter:
http://www.arcamax.com/news/vocabulary/s-362803-198328
microcosm \MY-kruh-koz-uhm\ (noun) - 1. A little world. 2 : A smaller,
representative system having analogies to a larger system.
"You live in your microcosm and I live in mine, but you'd like to
believe that because your microcosm produces a regular check it's more
valid than mine." -- Charlotte Vale Allen, 'Dream Train'
Microcosm comes from Greek mikros kosmos, "small world."