There are many times in class when I show the before and after (bad and better) pictures. Flat light is not bad necessarily. Sometimes it is indeed the right light. I do not equate light with perception of depth. There are so many other clues that tells us depth besides light. Not sure what you are trying to say. That I show the wrong pictures in my classes? There is nothing to be learned from just looking at great pictures? Need to show bad ones as well? Guess you are trying to put museums out of business. Gene