How do we describe human memory? Perhaps it is like the sand, scraps, dirt and dust at the bottom of deep ocean, quietly sleeping emotionless on the ocean bed. Sometimes, however, a sudden water current stirs the polished and sharp fragments, and we seem to remember a certain landscape, or some story, which dies away with the flow the next second. Then, the concrete memory disintegrates again into emotionless fragments, accumulating on the thick sea bed.