The interaction the user has with Kachi-Katah is similar to the interaction with Ikebana. It is a Japanese flower arrangement, in which the floral designers and the viewers experience a sense of imperfection, impermanence and incompletion. Kachi-Katah is a sculpture that creates a sittable surface. When it is unfolded, the user can compose his environment, changing how it stands and how the blocks of the seatback create negative space.