The first volume catalogues the artist's early figural works; sculptures from 1951-1955 including his works for the Santuario Arantzazu in Oñati, Spain; and later works from 1966-1988, which includes some sculptures for Arantzasu, as well as potratits and medals. Volume 2 includes the catalogue of Oteiza's abstract and experimental sculptures: open polyhedrons, 'constructions', 'chalk laboratory studies', experiments on curves, and dihedrons and trihedrons of 1959-1959.