Interesting thing about broad topic conferences such as this is that you'll see people from all sorts of disciplines, places, approaches present papers on all sorts of topics.  This morning, for instance, I heard Emma Engdahl, Marie Gelang, and Alyssa O'Brien's "The Visual Rhetoric of Store-window Mannequinas," the title of which gives you a good idea what the paper was about.  Luckily, the presentation was accompanied by a slide show of mannequins from various times and places.  The authors noted the particular phenomenon of headless mannequins, a fact which inspired much discussion.  There are a couple of more papers on the topic of visual arguments (one, in fact, on visual negation–I hope to see that one tomorrow).