

Those of you who have ever attended a ‘Fête Nos’, a typical Brêton festival-type of gathering with music and people dancing, may immediately understand what I’m going to write about. All the others who have attended another gathering of a large number of people will also be completely familiar with my revived curiosity in a specific subject: The collectivity of human behavior and its occurrence in large masses of people.
Every time the music starts at a crowded ‘Fête Nos’, something peculiar happens: within seconds the mass of people all talking to each other and walking seemingly random suddenly are dancing all together in familiar patterns. This pattern is way too complex to be laid upon all those people: it must, somehow, emerge from the individual moves these people make. Interesting and intriguing, don’t you think?
Even before I started studying sociology I had read `Critical Mass’ (2004) by Philip Ball. I loved this overview of popular science and still do, but somehow it had moved to the back of my memory. I remembered the actor- or boid-based simulations, but I did not really understand how this could be related to the theory-driven sociology that I was studying. I recognized the possibilities offered by the described simulation techniques, but saw them as theories, rather than empirical tests: we can easily make assumptions about behavior and simulate the consequences of that, but then we still don’t know if these assumed behaviors indeed exist and happen in reality.
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