You might as well ask what sex is. It's something you need to experience to understand. Go to a gathering. Basically it's a bunch of hippies (and not just hippies anymore. Lots of punks, christians, hare krishnas, computer programmers, etc. everything) camping together.
It's like a festival, without admission fee, without vendors, without paid employees, without anyone being in charge. All entertainment and education is spontanious, informal, and free.
It's something different for everyone.
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