This series is organized around the theme of memory, in the sense of exploring the relationship between introspection and the outside world, and the four-dimensional space. Why does the materialistic process of a single life form, which buds, opens its petals, and then falls away, appear in people's consciousness as the phenomenon of "flowers"? This is the question that he poses in this series. The cherry blossoms depicted as one of the motifs in this series continue to the present day as an exploration of the abyss behind existence.