Nineteen greys Bridget RILEY Study for 'List' Poster Bridget RILEY Nineteen greys Bridget RILEY Enclosed spheres Stanislaus OSTOJA-KOTKOWSKI Nineteen greys Bridget RILEY Pavo Stanislaus OSTOJA-KOTKOWSKI The planet Stanislaus OSTOJA-KOTKOWSKI Nineteen greys Bridget RILEY Opening Bridget RILEY Halo John VICKERY Signe 13 Victor VASARELY Weaver 5 Col JORDAN Twisted curve, olive dominance Bridget RILEY Turquoise, olive and magenta verticals Bridget RILEY Object II Col JORDAN Study for "Search" Bridget RILEY Attika + Victor VASARELY