The "El Dorado" Dunefield (by Dr Paolo C. Fienga)

"...There are places where vast accumulations of sand, weighing millions of tons, move inexorably, in regular formation, over the surface of the country: growing, retaining their shape, even breeding, in a manner which, by its grotesque imitation of life, is vaguely disturbing to an imaginative mind..."

Ralph Alger Bagnold (1896 - 1990)