Why Doesn't the Leaning Tower of Pisa Fall? The Answer Is the Lean Itself.

Why doesn't the Leaning Tower of Pisa fall? It tilts 3.9°—almost 4 feet off center.
The answer: The soft soil causing the lean also prevents collapse.
How it works:

Tower presses down on clay beneath lower side
Pressure compresses and strengthens the soil
Compressed soil pushes back, supporting the weight
Tower finds balance: leans enough to strengthen ground, not enough to fall

Self-stabilizing system.
Engineers discovered: Straightening it completely would weaken it (compressed soil would lose support).
The tower is safest when leaning.
850-year-old engineering accident that stabilized itself.
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