The unique design concept of A139 is rooted in the basic geometric idea of two interlocking rectangles. This distinctive feature, along with the incorporation of rectangular geometries into the natural environment, sets it apart. The deliberate placement of a few windows in the front enhances privacy, while the addition of wooded and water elements to the facade creates a sober and elegant aesthetic. The project maintains a common language in its materiality: apparent concrete, steel, and wood. The three materials are presented sincerely from the outside of the house and continue on a constant journey through the interior. A139 is adjacent to the spring forest, privileged in its geographical position. We considered that the project’s purpose was that from any point of the house, we would have panoramic views that would serve as ambiance for itself and thus generate “natural pictures.” Our design philosophy for A139 was to seamlessly integrate the forest into the house. To achieve this, we created interior courtyards and spaces, blurring the boundary between the exterior and the interior. This approach not only enhances the living experience but also fosters a harmonious relationship with the natural surroundings. The house’s program is characterized by its social areas on the first floor, which can be combined to generate larger spaces if necessary. On the first floor are four bedrooms, each with a dressing room, bathroom, and terraces overlooking the spring forest. Casa A139 speaks for itself and presents itself honestly, subtly setting the views and ample spaces in the hierarchy by the natural textures of the materials.