Usually the swirl progresses as you get away from the center. Always, really. And then the coverage vignettes. However, I did see pretty wild affects if the rear elements are assembled in the wrong order, as discussed above.
Compare the swirls here:
http://www.flickr.com/photos/unreala...ool-868027@N25
http://www.flickr.com/photos/garrett...ool-868027@N25
http://www.flickr.com/photos/djkloss...ool-868027@N25
...and you will see distinct differences between them and the original post. Notice how the swirl is a function of both distance from the lens and distance from the center? (Range and Azimuth from my old Navy days) It is a somewhat subtle effect with the key drivers for swirl being; items with a lot of small contrast/highlights, items towards the outer edges, items in a key area of out of focus beyond the focal point.
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