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But repair may not be possible. The desert around the lines is made up of white sand capped by a darker rocky layer. By walking through the desert the interlopers disturbed the upper layer, exposing the lighter sand below. Visits to the site are closely supervised — ministers and presidents have to seek special permission and special footwear to tread on the fragile ground where the 1,500 year old lines are cut. “A bad step, a heavy step, what it does is that it marks the ground forever,” says Castillo. “There is no known technique to restore it the way it was.” Castillo says that the group walked in single file through the desert, meaning that they made a deep track in the ground then they spread out in the area where they laid the letters, making many more marks over a wide area. “The hummingbird was in a pristine area, untouched,”. Castillo added. “Perhaps it was the best figure.”"