What is the theme in Purity and Danger: An Analysis of Concepts of Pollution and Taboo by Mary Douglas?

Pollution is the main theme of the book. Pollution symbols reveal elaborate cosmologies. Contemplating pollution instigates the examination of matters such as order, form, life, and death. Through the analysis of purity, the concept of dirt in its practical as well as theoretical form can be considered. Further investigations unravel that sacredness is also connected with pollution as indicated by primitive culture experience.