Motion in a seascape is constant. Depending on your shutter speed you can either catch it mid flight as in my previous Motion post or select a slower shutter speed to track its motion in one photo.
Living on the Gold Coast I never tire of the motion of the sea. I can take a picture of the same place at different times and with different shutter speeds, light etc and have a completely different photo from the previous one. It is always there, unceasing, yet no two waves are the same.
I have shown this picture previously. It has been taken at Glenelg Pier in South Australia and highlights how the different shutter speeds (motion) and light give a different effect on the landscape.
For at these shots I have used a 10 stop ND filter of course to adjust the amount of light for the slower speed.