Small preferences can produce a segregated world that nobody explicitly chose

Parable of the Polygons turns a model associated with Thomas Schelling into an interactive neighborhood of triangles and squares. Each shape is willing to live in a mixed area but wants some minimum share of neighbors like itself.

Moving only the dissatisfied shapes can generate strong segregation even when no individual demands a completely homogeneous neighborhood. Changing the preference threshold lets the reader see how modest local rules can produce large collective effects.

The second experiment begins with an already segregated arrangement. Simply removing the preference does not automatically remix the population: contented residents have no reason to move. Introducing a small preference for variety changes the dynamics.

The authors explicitly acknowledge that real societies are more complicated. This is a model of one mechanism, not a complete empirical explanation of segregation or proof of any specific policy. Its enduring contribution is to make the difference between individual intentions, aggregate outcomes and inherited starting conditions something the reader can experiment with.