I believe this lone figure is a clam digger, the end of his rake concealed. I live much of the year on the water, and have occasionally watched a clam digger out in the muck at low tide on the coldest days of winter, which has struck me, as this photograph does, as about the most existential feeling thing in the world. But this photograph feels very Zen too, with the ripples on the surface of the water evoking raked sand in a Japanese garden, which itself is meant to evoke ripples on the surface of water. Everything is everything, on and on. 

5 1/8" x 4 1/4". Silver gelatin print, c. 1940s or so I might guess, more nuanced and beautiful in hand.