My husband, to our kids: "Vous shakerez vos assiettes, s'il vous plaît."
Not exactly Académie française French, but a reference that's quite accessible to our kids, who've spent quite a bit of time at the Shaker Village in New Hampshire.
"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]