I spend a lot of time in public transportation looking out the window, thinking about the mechanics of society. I have always liked simulations so I thought: Why not try to simulate what I see? Watching the simulation from above of people going to supermarkets, going to work, trains delivering goods and such. Creating your own city and watching patterns emerge would certainly feels great.

A lot like watching little ants going around doing their business. This idea is also explored in one of the books of the Ants trilogy from Bernard Werber (I think?) where a society simulation is used to try out advertising campaigns.