Vi Hart and Nicky Case have created an interactive based on Nobel-Prize winning game theorist Thomas Schelling’s 1971 model of racial segregation.  The game is about how "harmless choices can make a harmful world,"

"a society of triangles and squares who are all only very slightly “shapist”: they actually prefer living in diverse neighborhoods, but they also demand that a certain proportion of their neighborhood are like them. The game starts with one simple rule: Shapes want to move if less than 1/3 of their neighbors are the same shape as them. The object of the game is to drag and drop unhappy polygons until they are all in a position that makes them happy."

The game makes three important points:

1. Small individual bias can lead to large collective bias.
2. The past haunts the present: "Your bedroom floor doesn't stop being dirty just coz you stopped dropping food all over the carpet. Creating equality is like staying clean: it takes work. And it's always a work in progress."
3. Intervention is necessary to maintain diversity.

Go to http://ncase.me/polygons to play the game!

Read more:
http://www.washingtonpost.com/blogs/wonkblog/wp/2014/12/09/how-tiny-individual-biases-have-huge-cumulative-effects-on-racial-segregation/
http://ncase.me/polygons/
http://www.stat.berkeley.edu/~aldous/157/Papers/Schelling_Seg_Models.pdf