I am usually heartened when I hear disagreements about matters of art and technique. Maybe I’m just combative that way. But, more likely, I think I take such debates as a sign there are more artists coming to the table. And, that the field is growing and evolving, with no end in sight. This can only mean good things for someone like me, who spends her whole day looking at art. One area in which artistic schools of thought differ is how to approach the matter of shading.