Beachcombers search our shorelines for lost treasures. Ocean currents carry all sorts of paraphernalia to the beaches. Some shores fill with lightbulbs, while others are taken over by lego blocks or ancient bones. Rob, who lives in Cornwall, cannot leave anything on the beach if he has touched it. Yolanda, a Dutch archeologist, studies erosion of objects in order to understand what effect time has on them. Our life, filled with bits and pieces, forms a visible archeological layer on Earth. Shige, a Japanese art teacher, is afraid of the ocean. He believes that the tideline is the border between life and death. Through the objects found on the tideline, the film forms a picture of mankind. Stuff that we leave behind is retained by the sea, then spat out, bringing messages from bygone times.