Top left: a screenshot of Freeciv, a 4X game.
Top right: The leaders in the Civilization game, created by Sid Meier.
Bottom left: the help screen in the Freeciv game.
Bottom middle: the leader Hatshepsut in the Civilization IV game.
Bottom right: Sid Meier's portrait, the creator of the Civilization series.
The sources of these media are mentioned in the Credits and copyrights page in this website.
During my studies, it was my favourite recreation: play with 4X games or real-time strategy games.
Among them: firstly Civilization: Call to Power, then later, Civilization IV and Rise of Nations.