Dynamic Word: Poems

"The term "concrete poetry" is now being used to refer to a variety of innovations and experiments following World War II which are revolutionizing the art of the poem on a global scale and enlarging its possibilities for expression and communication. There are now so many kinds of experimental poetry being labeled "concrete" that it is difficult to say what the word means."
Mary Ellen Solt
From Concrete Poetry: A World View (1968, Indiana University Press)  

Concrete poetry or shape poetry is poetry in which the typographical arrangement of words is as important in conveying the intended effect as the conventional elements of the poem, such as meaning of words, rhythm, rhyme and so on.
It is sometimes referred to as visual poetry, a term that has evolved to have distinct meaning of its own, but which shares the distinction of being poetry in which the visual elements are as important as the text.

Visual poetry is poetry or art in which the visual arrangement of text, images and symbols is important in conveying the intended effect of the work. It is sometimes referred to as concrete poetry, a term that predates visual poetry, and at one time was synonymous with it.