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I just saw a news item about Jim Sanborn. 20 years ago the CIA asked artists to submit proposals for artwork to be installed in the New Headquarters Building. His sculpture has a secret code text cut in four copper panels. To this day the whole thing has not been decoded. NPR reported that Mr. Sanborn is submitting a clue to help those hoping to crack the code.
Link to NPR story is here
One of my first assignments was to photograph Mr. Sanborn with one of his pieces at The Phillips Collection. When I was going through my archive I discovered it in my very first portfolio!