Who invented concrete poetry?

Who invented concrete poetry?
In the 1950's poets in Switzerland and Sweden and Brazil started, independently, to develop "Concrete Poetry" (partly as an adaptation of "concrete painting", a minor European school of the 1940's). In such poems, the arrangement of words and phrases on the page indicated the poem's meaning.Poets who have made such mergers of appearance and content include George Herbert, Lewis Carrol (pen name of Charles L. Dodgson), Ezra Pound, Guillaume Apollinaire, and Stephane Mallarm.