Step into the bustling streets of Grand Theft Auto 5’s Los Santos, or one of the many sun-dappled, monster-rich forests in The Witcher 3. These worlds are so fully realized, and at their best so compellingly true-to-life, that it’s easy to forget that all games, when stripped of the bells and whistles, are only systems operating on a specific set of rules. But more than just games run on complex systems of interaction, and Nicky Case has made this point before. You might remember Case’s previous project Parable of the Polygons, the cute bit of interactive sociology about geometry and…