Heinz Mack is one of Germany's most important contemporary artists. As co-founder of the ZERO movement, he has long been deeply rooted in the European avant-garde, and his oeuvre is an essential part of recent art history. This book presents the sculptural reliefs that are central to his artistic practice. Mack coined the term "light-relief" to describe his approach, a term that highlights the interplay between light and surface. With nearly three hundred color images, the book is the first to focus on Mack's reliefs, presenting works from 1952 to the present, including reliefs created in stone, wood, and even sand.