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Good point, although this particular metaphor is originally derived from racial segregation - the authors cite a landmark study on racial segregation in US cities as their motivation for the site.

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The sandbox at the end has a slider to change the ratio so you can tune it to simulate race instead of gender (although having more than two shapes would be nice, and also other dimensions than shapes to observe intersectional interactions).

[edit] ... and someone did add a shape: http://dncnmcdougall.github.io/polygons/

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