Alastair Grieve draws on personal discussions with these artists over many years and on extensive archival materials, including ephemeral catalogues which are difficult to find today. He offers much new information about the group and their theories, the Continental roots of their constructed abstract art, and their links with such contemporaries as American relief artist Charles Biederman and English constructivist Stephen Gilbert. The book features over 300 illustrations, many in color, and a full chronology and bibliography.