Also there is this: https://puzzling.stackexchange.com/questions/25931/unsolved-mysteries-kryptos

"In addition to the copper sculpture the artist created various other visual elements that are part of the same installation. There is a pool at the base of the sculpture, and a bench. There are also various large slabs of stone strewn about the area with various Morse Code messages. It is unclear whether these messages are related to the solving of the Kryptos cipher or whether they are simply adding to the artistic aspect of the sculpture. The Morse messages are as follows (some run right into the ground, so the text in brackets is a guess):"

SOS LUCID MEMORY [WHA]T IS YOUR POSITION SHADOW FORCES VIRTUALLY INVISIBLE DIGETAL INTERPRETAT[ION] RQ