There are times when I allow myself to write in a free flowing manner that tolerates what I would imagine is my subconscious influence upon the written product. While I recognize the term subconscious is perhaps passe in many academic settings, I am referring to an influence by that part of one's mind that one cannot be entirely aware of, yet still exerts some influence upon one's actions without concentrated efforts at thought.
The outcome of such writing will often produce some interesting word combinations. A small example for instance might be something that came out on the page last night, in a line that that contained these two words together: porous poison. Now in reality, I don't imagine poison as being porous. I can see poison seeping into porous cracks - perhaps an insecticide. That is a perfectly clear picture.
Still, I find allowing myself this broad freedom of expression in writing a liberating experience because it certainly seems to negate self imposed censorship. Such censorship I believe to be a great source of obstruction to the risk taking necessary to advance any form of art.
The question I still must deal with at some point, is deciding how much of such abstraction to allow into a poem. It is something which I do not presently have an answer for, though I remain devoted to some rational answer.