And then there is the option that the tower isn't vertical in the first place. The Pisa tower isn't the only one that is tilting. Actually quite a few church towers here in the Netherlands, especially those that have been build on peat soils, tend to tilt in all directions. The one in Dordrecht for instance is a big and famous example, that started moving to one side when it was build, so they decided to stop half way.
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