A singe frame from a motion-control timelapse sequence I shot last week at Death Valley's Racetrack Playa.

Some information about this phenomenon:

"Sailing stones, sliding rocks, and moving rocks all refer to a geological phenomenon where rocks move in long tracks along a smooth valley floor without human or animal intervention. They have been recorded and studied in a number of places around Racetrack Playa, Death Valley, where the number and length of travel grooves are notable. The force behind their movement is not understood and is the subject of research."

en.wikipedia.org/wiki/Sailing_stones

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