This book explores the manner in which architectural settings and action contexts influenced the perception of decoration in the Roman world. Crucial to the relationship between ancient viewers and media was the concept of decor, a term employed by Vitruvius and other Roman authors to describe the appropriateness of particular decorative elements to the environment in which they were located. The papers in this volume examine a diverse range of decorated spaces, from press rooms to synagogues, through the lens of decor. In doing so, they shed new light on the decorative principles employed across Roman Italy and beyond.