The Solo Houses project aims at reinventing the idea of the secondary house. Twelve architects were asked to express their creativity in a huge estate in Matarraña in Spain. On this occasion, the Japanese architects of Makoto Takei + Chie Nabeshima /TNA imagined this surprising pyramidal house. A splendid swimming pool uses the same geometric shape. The raw but lumninous aspect of the building offers a stark contrast with the natural surroundings.