An open bookcase's center of gravity does make it easier for a bookcase fall, but not by itself. Other factors must also be present. If the bookcase is not on level ground or if heavy items are placed on the top shelves with lighter items on the bottom the bookcase will pose a significant falling hazard. Another factor is the height of the bookcase. As the height of the bookcase increases, so does the falling risk. One other issue is the depth of the bookcase. The narrower the depth, the bigger the hazard. This is because a bookcase with a smaller depth has a smaller floor base, and this makes it easier for it's center of gravity to pull it down. If the bookcase is attached securely to the wall, these hazards will be eliminated.