Playground equipment for children, public furniture, art objects, meditation rooms, arbors, small rest rooms, waiting rooms, chairs with roofs. That are devices with various properties and functions, and we can arrange them at public places. Because of their comfortable sizes and shapes, we can transport them by a truck easily and install them, and each place is given a new public extension. That is devised at the particular point depending on its size: each cube is designed with a characteristic inclination, seat surfaces, windows, etc. Heuristic space experience!