When I sat down early this week with Derek McLane, nominated for his sets for both the 2016 Academy Awards and NBC's presentation of The Wiz Live!, I took out my camera to shoot some candids as we conversed. McLane suggested we switch places, explaining that the overstuffed bookshelves behind me would be much more interesting than the blank wall behind him. There may be no better illustration of the difference between a writer and a set designer than this. McLane is among…