Cellular Automata

In this chapter we present a view of cellular automata (CAs) as the quintessential complex system and how they can be used for complex systems modelling. First we consider theoretical issues of the complexity of their behaviour, discussing the Wolfram Classification, the Langton, lambda parameter and the edge of chaos. Then we consider the input entropy as a way of quantifying complex rules. Finally we contrast explicit CA modelling of geophysical systems with heuristic particle based methods for the visualisation of lava flows.