The most radically experimental is that poetry which appears without any publicity, scaffolding or promotion whatsoever, completely bereft of explanatory support networks.
Poetry is verbal music. If it has no music, I'm not interested.
Prose is absolutely necessary, especially for the most banal, vapid and insipid communications. The only thing on earth which does not require prose is poetry.
Poetry is conceptual music. If it has no sound waves, I'm not interested.
You needn't concern yourself with this useless gray pebble.