AB-I brings together four decennia of Coeckelberghs' artistic practice. The main core of the artist's oeuvre comprises paintings, along with sculptural work and installations. This monograph shows the evolution over time in the use of materials, means, techniques and forms, and of one of the core questions of Coeckelbergh's practice: a research on the concept of space in art, whether it is expressed in a two or three-dimensional way, or in a four-dimensional way, physically and mentally.