http://www.youtube.com/watch?v=MryiJVcsHkQ
It has the usual problem with Clark. A lot more questions than answers and deadends that seem to leave off before you get to the wall. But worth a few minutes.
I think he misses something, which is the role of the unintended document, the actual piece or momento from the act itself, as an image. This isn't just a quick cell phone image per se, but a kind of assemblage of pieces that are more grafitti than image...can't describe it. As usual, you know it when you see it.
CG