Ownership and trade are vital aspects of prevalent human culture. However, human concepts of, and our need for, ownership extend far beyond the practical necessities of food, land, resources, and energy. Throughout history, our most prized possessions have often been things with no direct useful or economic purpose. We have created and destroyed, fought over, won, and lost, items of emotional and cultural currency such as religious icons, jewellery, and art that represent the less tangible of our being. Things that manifest the unmanifest codify our ideas and encapsulate our humanity.