In 1912, he began his most ambitious project; a new house for his parents. also located on the forested hillside near La-Chaux-de-Fonds. The Jeanneret-Perret house was larger than the others, and in a more innovative style; the horizontal planes contrasted dramatically with the steep alpine slopes, and the white walls and lack of decoration were in sharp contrast with the other buildings on the hillside. The interior spaces were organized around the four pillars of the salon in the center, foretelling the open interiors he would create in his later buildings. The project was more expensive to build than he imagined; his parents were forced to move from the house within ten years, and relocate in a more modest house. However, it led to a commission to build an even more imposing villa in the nearby village of Le Locle for a wealthy watch manufacturer, Georges Favre-Jacot. Le Corbusier designed the new house in less than a month. The building was carefully designed to fit its hillside site, and interior plan was spacious and designed around a courtyard for maximum light, significant departure from the traditional house.