Mel Bochner's <i>Theory of Boundaries</i>.  I took this picture because
I thought the words in the boxes were interesting, like there was a
relationship between the words and the enclosing square, and because it
therefore could be inspiration for a Game clue.  Indeed, I later learned
there is such a <a target=_blank
href="http://www.nga.gov/exhibitions/bochnerinfo.shtm">logical
relationship</a> (see the second paragraph). <br /> Incidentally, Mel
Bochner has done other neat, thought provoking work as well.