Thomas, Mark Barendt is correct. However, what he describes is ignored by most people viewing any photograph, painting or drawing. Perhaps viewing lines should be marked on gallery floors, but people would ignore them.
I'm not saying he isn't correct, but I don't understand it. Can you explain?
"Often moments come looking for us". - Robert Frank
"Make good art!" - Neil Gaiman
"...the heart and mind are the true lens of the camera". - Yousuf Karsh