Segregation models
Demographic and urban segregation can be studied with a lattice model of neighbour interactions in which agents can move to a free space if the proportion of neighbours of a different colour exceeds a certain threshold. An initially random distribution of purple and blue agents (a) quickly develops strong segregation (b). The white squares are unoccupied. These results were generated by Paul Ormerod based on a model developed in the 1970s by Thomas Schelling.