Only woman mossaic artist in the world as assistant to Boris Anrep . Celebrities as floor decorations for National Gallery . Maria Volkova , the only woman mosaic artist in the world is assisting her cousin , Mr Boris Anrep , with his remarkable floor decorations at the National Gallery in Trafalgar Square , London . The design consists of eleven figures , ten of them representing well known people in Society and on the stage . The eleventh is a mystery figure .The persons whose features are being immortalised in stone are all personal friends of Mr Anrep . Among them are Mr Osbert Sitwell as Apollo , Mrs Ryan Guiness and Lady Jowitt . Photo shows , Mr Boris Anrep assisted by Maria Volkova , putting the finishing touches to his mosaic at the National Gallery , London . 24 June 1933