E-book by Dr. Robert Fischer, M.D., Paul Sanbar and Rebecca Deleon. Dr. Fischer is the Executive Director of the Optimum Performance Institute / Roanne Program.
This book uses a mirror analogy to explain Object Permanence. It is a very good analogy. Reading this short e-book will help you understand the idea of Object Permanence and how it relates to Borderline Personality Disorder. I would recommend it to anyone wanting to learn more about the subject.