Jeanene, "Good morning to you". When you fit a moulding to the wall/ceiling, you are telling anyone who looks at it "this is where the ceiling starts" its seems that you have drawn a line between them.
I know how to make the ceiling look lower, when you have high ceiling. its so simple you would not beleve it. As to make the ceiling look higher...I can only think of colours (colors) that will help you to loose the hight of the ceiling, the walls and ceiling must be the same color, and no line (different color) between them I hope I was a little help to you.... John 2000