Funny. I think of negative space as being somewhat all of one color - like the space between notes in music. When I read the article that Alistair posted it is all the picture that is not the main subject. So of course this fits the theme, but subconsciously I think it doesn't.
That aside I really like the picture - it has an amazing 3D quality to it. The sharpness and the OOF is perfect - really like the shot - brent