The most important work included in Volume 13 is "Totem and Taboo." In this text, which marks the beginning of the encounter between psychoanalysis and ethnology and is considered groundbreaking for ethnopsychoanalysis, Freud addresses "psychological" questions of peoples. He developed his ideas here about the similarities between the religion and customs of "primitive" peoples and the unconscious fantasies of his neurotic patients. Additionally, important texts such as "The Interest in Psychoanalysis," "Introduction to Treatment," and "Experiences and Examples from Analytical Practice" are included. The complete works of Sigmund Freud (SFG), established in 2015 by Christfried Tögel in 23 volumes, comprise the first collection of writings that includes all works intended for publication by Sigmund Freud—along with his reviews and contributions to handbooks.