Mystery Egyptian Desert Spiral

Update: Thanks to cowens and others who informed us that this is actually an absolutely massive piece of land art called desert breath. Click through for some images and a way better description than I gave it! What on earth is the purpose of this massive spiral in the Egyptian desert? It appears to be made from near-perfect circles scooped from the sand, which decrease in size toward the centre of the spiral
http://googlesightseeing.com/maps?p=...,0.003583&z=19