The Hirshhorn Museum in Washington, D.C. is hosting an exhibition of photographs by Hiroshi Sugimoto. My favorite of his works are his blurred photos of architecture. He explains why and how he achieved the effect:

Early twentieth-century modernism was a watershed movement in cultural history, a stripping away of superfluous decoration. The spread of democracy and the innovations of the Machine Age swept aside the ostentation that heretofore had been a signifier of power and wealth.
I set out to trace the beginnings of modernism via architecture. Pushing out my old large-format camera's focal length to twice-infinity—with no stops on the bellows rail, the view through the lens was an utter blur—I discovered that superlative architecture survives the onslaught of blurred photography. Thus I began erosion-testing architecture for durability, melting away many of the buildings in the process.