"Kryptos" by James Sanborn, is one of the three sculptures at the George Bush Center for Intelligence grounds. It runs a theme of information gathering and includes an encoded copper screen. Low-res image of the CIA's Kryptos sculpture, provided by the sculptor, <a href="https://en.wikipedia.org/wiki/Jim_Sanborn" class="extiw" title="w:Jim Sanborn">w:Jim Sanborn</a>.
Jim Sanborn
CC BY-SA 3.0
Jim Sanborn