Why are we so attached to our things?

After witnessing the "violent rage" shown by babies whenever deprived of an item they considered their own, Jean Piaget – a founding father of child psychology – observed something profound about human nature: Our sense of ownership emerges incredibly early. But why do we become so attached to things? Christian Jarrett details the psychology of ownership. [Directed by Avi Ofer, narrated by Addison Anderson, music by Marcos Tawil].