Errr hmm.. yeh!
I was going on what I remembered looking at yesterday. My brain added shading into the image. Odd. The line work helps suggest shade (to me at least) and this helps promote form. The fact that I was fooled into thinking their was a large volume of shading in the cheese is a obivious example of the simple but 'tricky' nature of the linework in the image.
Good Stuff