Sunlight is not impartial. On the Eiffel Tower, it can turn a fixed silhouette into a faintly skewed instrument: iron on the sunward face warms sooner than iron in shade, and differential thermal expansion lengthens one side a little more than the other. The tower does not visibly buckle. It yields, almost privately.The surprising part is scale: a monument made to look immovable behaves like a mea...More