For the architect Alvaro Rojas Vio, the construction of Kubo was an opportunity to deepen his commitment to the environmental development of the seaside town of Tongoy, proposing an urban element that could deliver aesthetic value to the town. This project had to address four challenges: a small plot of land, of only 400 square meters; to provide the clients with a spectacular view of the sea in spite of tall buildings nearby; a south-facing orientation, which required a strategy to provide light and heat; and to respond to a limited budget. The architect was inspired by simplicity, by minimalist dwelling, and designed an innovative solution of three floors, with low cost materials and maintenance with an emphasis on sustainability and energy efficiency. The facade impresses the onlooker with a feeling of great magnitude. However, it is the frontispiece of a design intended for small families, which does not neglect to provide comfort and an atmosphere of contemplation and rest. The first floor is concrete and is currently used for storage , but allows for possible future expansion . The second floor houses the kitchenette, bathroom and living area, and the top floor contains the master bedroom. Everything is arranged in a practical and simple way, with the ocean as a backdrop, harmonizing with large terraces to make the most of outdoor living space. The initial need for natural light and heat was accomplished by an elegant intervention: the staircase was built as a vertical space. It acts as a large tube of light that brightens the rooms. Visually, this gives order and symmetry to the spaces, and functionally it works as a natural air conditioner, providing cross ventilation. This architectural feature is complemented with wooden louvers that permit controlled levels of light, and a ventilated, sloped roof designed for future installation of solar panels. Thus, thermal insulation is achieved throughout the year, especially in summer. Along with energy efficiency allowed by passive design, the materials used in this building contribute to a reduced ecological footprint. Wood was used in most of its structure, fiberpanels and structural plywood inside, and exterior fiber cement, renowned for moisture and fungus control, which simulates the texture of wood on all exterior walls. Thanks to the excellent cost and quality of these components, the house stands out for its clean finish, its sustainable design and its feasible application in various geographical locations, even as social housing. Kubo House was built in 2011, in a record time of 40 days , under strict supervision and efficient use of available resources in the area. Its flexibility allows, for example, for the bedroom to be located downstairs and a living room on the third level, or for additional bedrooms for large groups, or for the inclusion of active design elements, such as water recycling systems , waste recycling or photovoltaic panels, among others.