B/4674 is a retreat for profesionnal teams, located in the forest along the Archambault River in the Laurentians, Quebec. B for box; 46-74 being the first digits of the geographical coordinates of the place. The particular aspect of the dwelling is that it is divided in two. The generated gap follows the path of the sun and the inclination of its rays. Within the gap is the set of vertical transitions from the ground floor to the roof terrace. This gap allows the house to bathe in natural light, all the way to the basement.