What is an “Interpreted Rock”?

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In the southern Utah wilderness six teenagers and two staff members are treking across the sage covered terain. One students is frustrated, throws his pack to the ground and sits down. He folds his arms and blurts out to the rest of the group, “I’m not taking another F-ing step!”

What is the principle of the “Un-Interpreted Rock”?

http://www.theinterpretedrock.com/2011/03/peek-inside-interpreted-rock.html