This shows drawing in "reverse" chiaroscuro. instead of drawing shadow shapes I draw the shapes of light. It requires a shift in attitude but the observation is very much the same as the usual approach.
Monday Drawing class. Today we talked about adding value to our compositions. Then I set up a still life and shined a light on it. The shadow shapes of these three amphora served as our composition. The goal was to describe the form and volume of the pots by accurately drawing the effect of light as it was cast across the surface.