After a wave knocks him over on the beach, a young boy finds a camera with a roll of undeveloped film. When he gets the photos developed, they reveal a secret eye-popping undersea world of what really lies beneath the surf. After studying the pictures with a microscope, he discovers there are also self-portraits of the previous young photographers dating back many decades. He happily adds his own photo to the group and returns the camera to the sea for another lucky child to find. A magically inventive wordless story, “Flotsam” is expertly paced and richly detailed. It dazzles with every turn of the page.