This man was renovating a boat in drydock. He was scrubbing down the hull, preparing it for a paint job. I used an "average" shutter speed of 1/60th of a second here. His action is moving horizontally across the frame. His left hand firmly holds on to the edge of the boat, remaining sharp, while his right hand suggests energetic movement. It is hard physical work, and the blur brings such effort home. The man seems linked to the boat both physically and aesthetically -- his maroon shirt is similar in hue to the boat's hull.