Where this painting came from is a mystery. In Sandia Mountain Hiking Guide, Mike Coltrin says “The Eye appeared sometime in the 1960s, but the originator is unknown.”
One blogger calls the painting an adaptation of an ancient Egyptian symbol of protection, power and health, the Eye of Horus. The artist, or some later artist, made the eye New Mexican by substituting a Zia Sun symbol for the pupil. Several sources suggest that the teardrops show the mountain's grief over the encroachment of suburbia or the roar of I-40 through the canyon below it.
On our way up, we also encountered this rock art, which depicts three coyotes howling at the moon. It is decidedly modern, but the coyote pictured below, which is from the La Cieneguilla Petroglyph Site, west of Santa Fe isn't.