In 1953, Robert Rauschenberg asked composer John Cage to drive his Ford Model A through some black paint and then across a long series of paper sheets Rauschenberg had glued together and laid out on the ground.  The result became an iconic work of art.  A key element of his Automobile Tire Print is its dependency on the interaction between two artists.  Lumen, too, represents a collaborative effort, between my own photographic work and the influence of Earl Duck as my host and tour guide at Conesville.  Without Earl, I would never have stood on the end of a coal conveyor belt, looking down on the fresh bulldozer tracks in the mountain of coal, attempting to capture the traces of that fleeting moment in time.