Q is everywhere
Kryptos
Solution of passage 1
Method : Vigenère
Keywords: Kryptos, Palimpsest
BETWEEN SUBTLE SHADING AND THE ABSENCE OF LIGHT LIES THE NUANCE OFIQLUSION
Iqlusion was an intentional misspelling of illusion.[19][20]
Kryptos artist - Herbert James Sanborn, Jr. (born November 14, 1945 in Washington, D.C.) is an American sculptor. He is best known for creating the encrypted Kryptos sculpture at CIA headquarters in Langley, Virginia.
Sanborn's 2004 book, Atomic Time: Pure Science and Seduction, includes images detailing his exhibit Atomic Time: Pure Science and Seduction inspired by the Manhattan Project.
https://en.wikipedia.org/wiki/Jim_Sanborn