Initially a prominent member of the De Stijl group with Piet Mondrian and Theo van Doesburg, César Domela's approach evolved into three dimensional abstraction described as ''enriched Constructivism.'' His harmonious integration of materials forms a transcendent visual polyphony. Each individual material was chosen after extensive, almost obsessive, consideration of its physical properties of color, texture, opacity, sheen, and what musicians refer to as ''timbre,'' a specific resonance. RAM Publications, 2007 136 pp., illustrations Harcover, ISBN 393685968X