 He developed unofficial diplomacy's "Tree Model," described "Linking Objects" and "Linking Phenomena" of perennial mourners, observed "Chosen Traumas" and "Chosen Glories" of societies and theorized the evolution of "Infantile Psychotic Self" in persons whose mental functions remain undeveloped.Linking objects – which may be actual objects, or actions, or some other form of identification with the dead – serve to tie mourners (often by way of a chance association) to the moment of their actual loss.Volkan's "re-grief therapy", building on the work of Edward Bibring, sought to free pathological mourners by taking them back "to review the circumstances of the death - how it occurred, the patient's reaction to the news and to viewing the body, the events of the funeral, etc.