When dressing a bookcase it is all about line, balance and scale! Typically a bookcase is the focal point in many rooms and should be given proper attention. Consider weeding out any books that are worn and tattered.. In fact, remove all paperbacks and store where they will not be seen. (These are not decorative items and should not be showcased.) Save only the best looking and most referenced books.
Positioning large items toward the top of the bookcase will give the appearance of being top-heavy and make the piece look unstable. Huge mistake! Position largest books and decorative accessories on the lower shelves. This not only places the