The authors suggest that ownership may be one of the critical entry points into thinking about social constructions, a kind of laboratory for understanding status. They discuss the features of ownership that make it an interesting case to study developmentally. In particular, ownership is a consequential social fact that is alterable by an individual, even a child. Children experience changes in ownership in a way they do not experience changes in other social facts (such as word meanings or social norms). Ownership is also an individual rather than a general property; two objects can be identical, but differ in ownership.