Problem
Concrete poetry represents a combination of the visual and verbal. The term concrete implies that the poem is itself only, and that there is no abstract meaning to be drawn from it. Various practitioners, dissatisfied with the term, have invented other designations: image poetry, word pictures, picture poems, and so on, but the term concrete poetry seems to stick. Concrete poems include everything from audiovisual puns to a series of images of letters blown up in size until the curve of a single "a" fills the page. One can look back as far as George Herbert's poem Easter Wings, written in the 17th century, for original concrete poems. Modern concrete poets use language in a variety of ways. Sometimes the appeal is mainly to the eye, while the repetition of a word may emphasize its sound.
As a sub-genre, consider spatial free verse. What differentiates these poems from concrete poetry, is the fact that the aural quality of the poems remains insubordinate to the visual. Look on the website for the poems of bill bissett.