BOSTON (AP) — When Jim Sanborn was commissioned to create a sculpture at CIA headquarters, he wanted to do something that spoke to its world of spies and secret codes.

The result was a 10-foot-tall, S-shaped copper screen called “Kryptos” that resembles a piece of paper coming out of a fax machine. One side features a series of staggered alphabets that are key to decoding the four encrypted messages on the other side.

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“At the time, codes and encoding was an esoteric subject,” Sanborn said. “I wanted it to be less so, and I wanted it to be fun. … Any artist’s goal when th

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