Its a wrought steel truss in the shape of a basic geometric construction. Impressive for 19th century civil engineering. Perhaps. Perhaps not.

Compare that to Notre Dame. Also really very tall, but with no iron skeleton, no continuum mechanics. Geometry, in fact, holds it together - an architect had no other tool at the time - but the basic shapes are subtle, and don't scream at you "I am a curve on the Cartesian plane"