Gary Warzin’s 2001 Palimpsest Theory has been reproduced as a permanent mirror (in memoriam) at KryptosRevisited.com!
Discover how this Kryptos enthusiast used Jim Gillogly’s CIA Sculpture report in conjunction with Simon Singh’s “The Code Book” to develop a theory about K4. Warzin claims that Kryptos is a physical palimpsest with underlying alphabet characters from the Vigenere Tableau peeking through.
http://www.kryptosrevisited.com/sculpture/solutions/gary-warzin.asp
I don’t think you need permission to ask the CIA anything you want. If they say, “Yes,” try pinching yourself. We’ve all had that dream.
Is it okay if I ask the CIA if I can dig up 38.951806,-77.145556 for you guys? Maybe ask around as to what that wall is called? Their web page sounds really inviting.
https://www.cia.gov/offices-of-cia/public-affairs/entertainment-industry-liaison/index.html
And if they say, “Yes,” would you like to come help me do it?
Sean Osman