Arnold van Gennep's major work "The Rites of Passage," first published in 1909, is considered a classic in ethnology, particularly concerning the perception and study of ritual and symbolic behavior. Van Gennep describes how different cultures have addressed the issue of crossing boundaries, which accompanies the dynamics of social life, through the development of rituals. These include changes in location, status, and profession, coming of age, aging, birth, and death. He refers to the associated rituals as rites of passage. His book provides a model that remains relevant today for categorizing and explaining ritual practices and offers a new perspective on our modern everyday rituals.