Structure

What makes good composition? Of course there are the basic structures of thirds, shapes, continuity etc that they will lecture you on in photography classes. But that should be second nature to a photographer. As Edward Weston said, "consulting the laws of composition before you take a photograph, is like consulting the laws of gravity before you walk."

They should just be there.

I am wondering what takes composition up a level, changes it from a good picture, to one that could be considered art.