JMB: Not sure what "world of art" might mean here, but I think they are important in that they show artistic/aesthetic creation has no real genre borders, in spite of what most people think. Vispo (I think of asemics as a form of vispo) is between visual art and literature, claimed by neither, and so "falls between the cracks" in most critical and/or academic studies. I like many kinds of art; music, photography, painting, conceptual, Fluxus or Dada, and of course literature. I work in many different genres. The best art has humor, horror, beauty, ugliness, love, hate, and much else, all simultaneously. It attempts to be a mirror to the universe, or a talisman of it.
John M. Bennett's work, publications, and papers are collected in several major institutions, including Washington University (St. Louis), SUNY Buffalo, The Ohio State University, The Museum of Modern Art, and other major libraries. His PhD (UCLA 1970) is in Latin American Literature. Visit John M. Bennett's website for more info.