] The "Cyrillic Projector" is just one of a number of code-bearing
] sculptures created by artist James Sanborn. The most famous,
] Kryptos, made front-page headlines in 1999 when code-breakers
] deciphered three-quarters of the secret message in the stone and
] metal sculpture. The last part, however, is still uncracked.

For those who aren't AAAS members, I also have a mirror page of the Science Magazine article here:

 http://www.elonka.com/kryptos/mirrors/ScienceMagazine.html

(subscription reqd) Science Magazine - Cryptic Sculpture Cracked