Kaibab National Forest geoglyphs "were created by Forest Service employees in the 1980s."
"In the late 1980s, two Forest Service employees were given the task of improving the seasonal wetland of Duck Lake, which is located on the Williams Ranger District just north of the popular Keyhole Sink archaeological site. The employees decided to have a little fun while developing additional areas for water to pool. The result is some creative designs that are indistinguishable from the ground but quite lovely from the air."
Since the Internet many puzzles are solved rapidly. Thus secrets and legends lose their luster too fast. That is a bit regrettable. Nevertheless, great mystical article and a spontaneous enlightenment. Very instructive for me.