An extension of Constructivism in Britain from about 1950 in the work of Victor Pasmore, Kenneth Martin, Mary Martin and Anthony Hill. Naturally occuring proportional systems and rhythms underpinned their geometrical art. They were inspired by the theories of the American artist Charles Biederman and explored the legacy of the 'Constructive art' made in the 1930s by Ben Nicholson, Barbara Hepworth and Naum Gabo, whose contribution to the Russian Constructivism was exemplary. Hill insisted on using the term Constructionism for the British phenomenon, but Constructivism is more commonly found.