The books were stacked on the pallet in four towers of thirteen. Yesterday I was perturbed to notice that the two towers further from the side wall were looking like the leaning tower of Pisa and even the two next to the side wall were beginning to lean. Prompt action was needed to prevent a damaging topple. While I was visiting friends, the handyman, who also happens to be a resident of my unit block, re-stacked the books.