This is a story of how harmless choices can make a harmful world.
Interactive simulations with a population of 50% Triangles, 50% Squares, and 100% slightly shapist. But only slightly! In fact, every polygon prefers being in a diverse crowd. site 
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1. Small individual bias → Large collective bias. When someone says a culture is shapist, they're not saying the individuals in it are shapist. They're not attacking you personally.
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. Demand diversity near you. If small biases created the mess we're in, small anti-biases might fix it. Look around you. Your friends, your colleagues, that conference you're attending. If you're all triangles, you're missing out on some amazing squares in your life - that's unfair to everyone. Reach out, beyond your immediate neighbors.
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Like the game of life except with two kinds of marks that are neither born nor die but simply move to a random opening when their preference for neighbors doesn't fall within adjustable parameters.