It's really hard to sum up the collective behavior of what is soon to be 7 billion individuals, I think. It's even harder to make that ultimatum span back through time, relating us today to the Sumerians or some other ancient people. That single strand that ties us together must get so lost in the noise of cultural, geographical, and individual personalities. Some people say that it's something basic that drives us, animalistic - like the sex drive or something. Or maybe that the essential thread is the desire for a higher meaning, for truth, justice or communion. Still others think that there's an inner heart of darkness to humankind, that greed, laziness, or fear drives our acitons. I think the only human nature is to be unnatural. By this I mean that everything humans fabricate something artificial to deal with what is actual. So long as we all suspend our disbelief to this fabrication, it remains real. A simple example is money. A $100 bill is, in terms of the amount of paper its made of, just as worthless as a $1 bill. But we all agree the former to be worth much more, and therefore it is. This doesn't just apply to physical organizations. For instance, everyone agrees that killing another person is wrong. Why? Other than the reason that we all agree that murder is wrong there's little explanation. Morals and ethics are arbitrary -- they're constructed for the sake of civilization, for coexistence. I think humans create these ideologies (as Althusser would call them) for the sake of having some common ground on which to stand. If we didn't have things like laws, currency, gender, race, religion, etc., (some of which are systems that have some major problems with them) society would fall apart. Humans are unnatural as a prerequisite to civilization, the separating factor between us and other life; therefore, it's our invention (our imagination and ability to believe as fact what is fabricated) that is "our nature". ... or at least I think that sounds kinda cool