Metagraphy, also called Metagraphics, post- or meta-writing, is a concept developed by the Lettrist movement in the 1950s, which encompasses a synthesis of writing and other forms of media. It was described by Isidore Isou as "Metagraphics or post-writing, encompassing all the means of ideographic, lexical and phonetic notation, supplements the means of expression based on sound by adding a specifically plastic dimension, a visual facet which is irreducible and escapes oral labelling..."