The Racetrack is home to the rocks that appear to slide across the surface of the playa. Noone has yet witnessed the phenomenon, although the rocks certainly do move! Theories suggest that the surface of the playa becomes slick after rain, and at such times, winds provide the motive power. However, on close examination the rocks (all of whom have been named!) gouge through the mud, so the winds would have to be extremely strong. The phenomenon is unique to Death Valley.