Sorry David. You are asking the wrong person to write a short synopsis.
I am both unable to do so and feel that breviry/brevity without poetry
is misleading. Read the Poem again that is the best short answer that I
can geve.

There is a good somewhat longer description in Cathre/Catherine Belsey's
"Critical Practice" publ;ished by Metheun, 1980.

Ray Lauzzana
Editor-in-Chief, Languages of Design
1167 Pacific
San Francisco
CA 94133, USA
+1 (415) 567 4157
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