What made this especially dizzying to me was the movement of the passing clouds overhead.
"Now to what phenomenon did I give primary concern in designing the Tower? It was wind resistance. Well then! I hold that the curvature of the monument's four outer edges, which is as mathematical calculation dictated it should be...will give a great impression of strength and beauty, for it will reveal to the eyes of the observer the boldness of the design as a whole." -Gustave Eiffel [see original French* below]
The tower sways two to three inches (6-7 cm) in the wind. I think we definitely experienced a little of that the day this photo was taken.
Uh oh...I think I'm feeling queasy again...
*"Or de quelle condition ai-je eu, avant tout, à tenir compte dans la Tour? De la résistance au vent. Eh bien! je prétends que les courbes des quatre arêtes du monument, telles que le calcul les a fournies...donneront une grande impression de force et de beauté; car elles traduiront aux yeux la hardiesse de la conception dans son ensemble..."