I stood in one spot on a dune above the beach in Pentwater while waiting over an hour for the magic light to appear. In that time, I used a spherical perspective to imagine what different compositions would be in nearby locations. I knew that once the light appeared, I would try to make one of my shots from the water's edge and would have to lie on my stomach to capture it. My previsualization paid off. In two minutes, I made four strong images from four different spots that were all within 40 yards of my original spot on top of the dune.