Despite the fact they only appeared in one game (Sim City 2000), arcologies remain an iconic symbol of the Sim City series. But just what the hell are they? While appearing in the game as projects from the future, arcologies are very much real, the name deriving from "architecture" and "ecology".
An arcology is, in simple terms, a superstructure, a single entity that exists to not only house a large number of people in "hyperdense" living conditions, but enable them to be almost entirely self-sufficient at the same time.
While the idea of an arcology has existed for some time, the concept did not become popular until Paolo Soleri did two things: devote his life's work to actually building one, and coming up with the name "arcology".
Read the full piece at Kotaku.