Casa Cosmos by S-AR, located on the Pacific coast of Puerto Escondido, Oaxaca, is a restrained yet transformative retreat defined by its geometric concrete frame, sliding macuil wood panels, and strong relationship with the landscape. The home’s square core contains the essentials: bedroom, bath, kitchen, and living. Open terraces, patios, and a rooftop reflecting pool blur the boundaries between architecture and nature. Elevated above the terrain to allow water, wildlife, and air to move freely beneath, the house responds to both climate and seismic conditions with locally sourced materials, passive cooling, and a thoughtful water system. Designed as both a shelter and a lens onto its environment, Casa Cosmos invites visitors to experience the rhythms and richness of its coastal setting through simplicity, craftsmanship, and quiet innovation.