Jo Delahaut was one of the first Belgian abstract artists after 1945. As a member of the movement La Jeune Peinture Belge [Young Belgian Painting] he realized his first abstract work in 1946. In 1952 he founded, together with Pol Bury, the group Art Abstrait [Abstract Art]. During that period he formed his own unique style, in which he assumed existing forms: half circles or rectangles with one blunt angle. In 1956 and 1960, he founded the groups Formes and Art Construit [Constructive Art]. In 1956 he signed the manifesto Le spatialisme [Spatialisme]. He simplified his oeuvre and approached American hard edge style. Delahaut also produced three-dimensional work during that period and was interested in architecture. In 1975 he established an integration for the Brussels metro station.