Ownership is on most people's lips these days, or at least the lack of ownership. Everywhere people seem to be fighting over what is theirs. They want to take back their property, their lands, their liberty, their bodies, their identity, and their right to do what they want. These are all things people can own. These demands are quite remarkable when you consider that ownership is not an observable property but rather an abstract concept. And yet this abstract concept controls just about everything we do, and can do. What we can call ours, what we can do, where we can go, and who we are is all determined by ownership, but we rarely stop to consider how it rules our lives. Ownership even explains the anger and political turmoil that is currently sweeping over Western democracies. People feel they have had something taken away, something they used to own in the past and want back.