Imitating a process or system with a model, usually a computer program, to see how it behaves over time.
For me, simulation, I think, is the medium that I'm dealing with.
Lawrence Lek, Lawrence Lek on NOX and Worldbuilding
Boids is a simulation of flocks of birds as a decentralized system. You have a set of rules such as: “Be near the other elements but don't touch them” or “Match the heading or vector of the others.” From these simple rules, incredibly fascinating and complex murmurs emerge.
Casey Reas, Casey Reas on the History of Generative Art - Part 2