The subjective experience of the written poem varies with the form.

For example, a business letter that has been typed carefully (with high-quality paper, laser printing, proper layout, and company stationery) will affect us differently from a scribbled note (in crayon, on a grocery bag). Both letters might say the same words, but their context changes the meaning -- especially if they are, for instance, job applications.

The only written language that could directly express a visual reality would be one of pictures. A drawing of a face says more than the word, "face."

Egyptian hieroglyphics, and oriental languages, are written in pictures, although the forms are too abstract to be understood unless we use the same intellectual process by which we would read words.

Imagine a poem of nothing but pictures. Is it a "poem"?