Lettrisme was a French avant-garde movement founded in the 1940s which takes the form of visual poetry, with artists using calligraphic techniques to superimpose letters on various objects from furniture to film

Founded by the Romanian-born artist Isidore Isou in the mid 1940s, the movement was associated with the Situationist branch of the anarchist family and became the art that dominated posters and barricades in the Paris Spring of 1968.

Because lettrisme uses calligraphic techniques it foreshadowed layering and other computer techniques, and is sometimes called hypergraphie. Both mail art and contemporary graffiti art, which share many of the lettrisme’s basic characteristics, could be said to have evolved out of lettrisme.