Interestingly, Grant Ernhart stumbled upon photography while competing nationally as a biathlete (fantastic cross-country skiing and rifle shooting combination sport) and studying rolfing (soft tissue manipulation to improve movement and posture). Once he discovered his passion for photography, he moved to San Francisco to study and pursue his new-found life choice. I say life choice because I believe photography becomes all consuming. Your camera becomes your eyes and vice versa.
I think that these particular images display oddities in nature. Of course, anything out of place in them is human-made.
Check out the rest of his works @ www.granternhart.com.
Images from his site.