Basilica Palladiana

One of Palladio's technical masterpieces, it is difficult to see what all the fuss was about when you see it in the flesh. Indeed you hardly notice the subtle variations in bay size when you view the building overall. Palladio had been tasked with putting a "modern" (classical) facade onto an existing Gothic building with irregular bay sizes. To overcome this challenge, Palladio kept the arches all the same size, and rather than simply supporting the arches on solid piers of varying width, instead used double columns separated from the piers by spaces varied to compensate for the irregular bay widths.

When you look closely it is obvious, but otherwise..