Emmett Williams’s A marching song in the shape of 10 “Dixie” cups and Sense Sound 1955, published 1989, epitomise the aims of Concrete Poetry, in which text is arranged to invite the viewer’s active participation. The words and letters become sounds and syllables as well as forms and images. The practice of Lettrisme and Concrete Poetry extend the sensual range of text by producing an audible element — even if the words are spoken silently to oneself — in addition to their graphic or visual dimension.