All in a Row

When on a photoshoot, I often look for repeating patterns in nature or those created by man. Here is a series of images that all have something in common. 1) "Ducks in a Row," 2) "Beached Dingys," and 3) "Turtles in the Sun." Can you discern the commonalities? By the way, "Ducks in a Row" and "Beached Dingys" were taken on Coronado Beaches. And, surprisingly, "Turtles in the Sun" was taken while shooting a graduation portrait at San Diego State University.