Book excerpt: Human beings have always had a penchant for collecting images. The challenge today is that almost anything and everything in the world is available as a viewable image. Consequently, say O'Connor and Greisdorf, image collections can no longer be the result of ad hoc processes rooted in antiquated methodologies. To this end, they present the reader with an interdisciplinary approach to the principles, practices and belief systems underlying categorization and image management. The book is divided into three parts: defining the nature of images; describing how images are used; and explaining how and why images are collected (including the mechanics of storage and accessibility). Individual chapters contain a historical perspective on the subject matter and supporting research. Liberally enhanced with illustrations from the authors' own collections. For anyone who cognitively engages with image collections either vocationally or avocationally.