Learning that surprisingly complex behaviours can emerge from simple rules was a bit of a lightbulb moment for me. The Game of Life is the premier but Schelling's segregation model is one of my favourites.<p>There are a bunch of these models available in the standard library that ships with NetLogo.<p><a href="https://ccl.northwestern.edu/netlogo/" rel="nofollow">https://ccl.northwestern.edu/netlogo/</a>