Using a slow shutter speed to capture motion of foam or leaves in a swirling eddy has become somewhat of a cliche in modern nature photography. Okay, that's an understatement. People seek "swirlies" with the veracity of a used car salesman who has just spotted a virgin car buyer. Nevertheless, they have become popular for good reason. The implied motion promotes the viewer's eye roam around the scene and create a moving (literally) composition. The eddy portrayed here is one of the largest I've seen, and I just couldn't resist trying my hand at capturing the flow of it.
Techs: Canon 7D, Canon 10-22 @ 10mm. 13 seconds, f/16, ISO 100. Polarizer.