William Durandus's The Symbolism of Churches and Church Ornaments is a translation of the first book of Rationale Divinorum Officiorum, which explains the symbolic meaning of church architecture, layout, and religious artifacts such as altars and priestly vestments, as they relate to the teachings and practices of the Catholic Church. This book is an essential resource for scholars of theology and medieval art, as well as those interested in the history and symbolism of religious practices and artifacts. Durandus details how these symbols represent beliefs and practices within the Catholic Church, making it a valuable resource for understanding medieval theology and art.