Property law is, in some areas, dangerously out of step with property expectations. Property—the idea that a place, object, or idea can belong to a person—is at the root of the world’s economies and thus also at the root of much of its laws. Property is neither solely a creature of positive law, nor of some abstract natural law with a moral underpinning, but rather may be biologically determined, much as Noam Chomsky proposed for languages in Aspects of the Theory of Syntax.1 The idea that ownership is at least behaviorally, and perhaps to some extent instinctively, determined has been extensively explored in academic literature2 and in popular works including Michael Heller’s and James Saltzman’s recent bestseller Mine!3 This Article takes...