An open source project is a complex organism. Like a carbon-based lifeform, an open source project is usually a fantastic mix of a number of systems (and theories) that vary in complexity, interact closely, and that can't function effectively (or at all) without support from surrounding components.
Lately, there's been a lot of talk about community. Community is a fairly abstract term, and to continue the project as an animal analogy, it's pretty safe to say that if the software is a measurable biological system, the community has long been equated with the soul.