This book investigates the evolution and meaning of book illumination from late Antiquity through the Renaissance. Otto Pacht, drawing from his lectures at the University of Vienna, provides a comprehensive analysis of book decoration and illumination, focusing on format and style. He establishes foundational vocabulary and concepts for understanding this art form, exploring the philosophy, theology, technology, and culture that shaped its history. The work examines pictorial decoration within the book's structure, the significance of initials, and the diverse roles of miniatures, including biblical, didactic, apocalyptic, and psalter illustrations, while also considering the interplay between surface and space.

This seminal work by Otto Pacht is widely regarded as a foundational text in the study of medieval manuscript illumination. Art historians and scholars frequently cite its rigorous methodology and comprehensive scope, which systematically breaks down the complex visual language of illuminated books. The book's approach, grounded in Pacht's extensive lecturing experience, makes intricate concepts accessible while maintaining scholarly depth. Its enduring influence is evident in its continued use as a primary reference for understanding the art, technology, and cultural context of medieval book production.