Seems like the K1 solution, "BETWEEN SUBTLE SHADING AND THE ABSENCE OF LIGHT LIES THE NUANCE OF IQLUSION", is potentially in reference to his (then not yet buil

Seems like the K1 solution, "BETWEEN SUBTLE SHADING AND THE ABSENCE OF LIGHT LIES THE NUANCE OF IQLUSION", is potentially in reference to his (then not yet built) Cyrillic Projector[1] sculpture and possibly a play on the word occlusion and/or a reference to Ambient Occlusion[2] given Sanborn's direct interest: "After Kryptos, he went onto a segment of his work where he was fascinated by the way light was projected onto things," says Dunin. "He went out into the southwest of the US at the middle of the night and he'd beam a pattern of light onto a mountain and use time-lapse photography to record it. There's dozens and dozens of pictures. They look like they're made in computer graphics, but they're Sanborn beaming light on mountains." Given K2 also seems to be referential back to other Sanborn works, my guess is that the clues/keys lie in his other works... Interesting stuff. [1] http://images.eurogamer.net/2013/articles/1/6/8/1/6/7/0/the-game-developer-the-cia-and-the-sculpture-driving-them-crazy-140188824284.jpg http://images.eurogamer.net/2013/articles/1/6/8/1/6/7/0/the-...