Negative Drawing

Diane Wright was talking about negative drawing and so I took up a challenge to do a quick 3x5" RI that was being discussed in our Yahoo group Line to Life. I studied my process and realize that I do this naturally without even thinking about it. Is it something I was taught or something that is just the way I see shapes in general. I gather a bit of both, because I was taught contour drawing as a young teen. I always have been a student of shape, my eyes do not rest. Now I have added color to it, and I am afraid I am going to have a traffic accident due to distraction. Abstract shapes, color shapes, tonal shapes, light/shadow are all rushing at me. They seem to say, "Hey!! Look at me today!" I have been stopping to take notice.