The top-down method is an approach to information processing that involves the breaking down of a concept into its various smaller components thus creating one or more subsystems of the original system.  This is typically how we analyze or deconstruct information.  Lately I have been taking this approach with my artwork.  I start with the very vague concept of a piece and then approach it as though I was solving a math or science problem.  As I begin working, I begin to understand some of the underlying concepts and my idea becomes less vague.  As I continue analyzing my original concept, it becomes more specific and fine tuned. Subsequently, the piece also becomes refined. Subtle detail alludes to the subcomponents of the main components of the overall piece.