It looks like a daytime picture but there was only the full moon. With enough exposure, what looks like black sky to me becomes sky blue to the film. The dreamy quality is made by the passage of light clouds blowing through during the exposure, and by the cumulative misty effect of waves breaking on the shore. A rogue wave climbs far up the beach and glistens in the moonlight for a moment before sinking back into the sand. A close look will find masts waving as their moored sailboats maneuver against the wind.
The constellation Orion is hiding in the clouds. The three belt stars make a characteristic cat scratch during the time exposure. To the left, undimmed by faint clouds is Sirius, the brightest star in the sky.