Aren't CD cases slightly heavier on one side? There's a pivot mechanism on one side and not the other; the CD isn't placed at the exact center of the case; and

Aren't CD cases slightly heavier on one side? There's a pivot mechanism on one side and not the other; the CD isn't placed at the exact center of the case; and the paper insert (as well as any staples it contains) can also affect the balance. So you might be able to extend the tower a few millimeters more than what mathematical algorithms allow, by aligning the heavier side toward the desk.