The Gaia Controller is a wonder in Call to Power II. Work on the Gaia Controller can begin as soon as any civilization completes the Solaris Project. Players must build a Gaia Controller Core in ten of their cities and at least ten Gaia Satellites as well. Although more than ten Controller Cores will not be necessary, one can build as many as 20 Satellites to increase the radius coverage of Obelisks. Finally, one must place Obelisks at strategic locations across the map.