 The GlassBox Engine replaces those statistics with agents, simulation units that represent objects like water, power, and workers; each graphic animation is directly linked to an agent's activity.For example, rather than simply displaying a traffic jam animation to represent a simulated traffic flow problem, traffic jams are instead produced dynamically by masses of Sim agents that simulate travel to and from work.A four-part video has been released featuring Dan Moskowitz, the lead gameplay engineer, talking about the engine simulation behavior.