The clients, a young couple with two children who after living in a conventional home wanted to change to one integrated to nature. The land, with upward topography, is limited to the south, north and east by high buildings. The west adjoining provides a wide view of the mountains.The model work generated numberless changes until achieving the volume needed by the construction: the Nautilus. The metaphor was to feel like an internal inhabitant of a snail, like a mollusk moving from one chamber to another, like a symbiotic dweller of a huge fossil maternal cloister. This home social life flows inside the Nautilus without any division, a harmonic area in three dimensions where you can notice the continuous dynamic of the fourth dimension when moving in spiral over the stairs with a feeling of floating over the vegetation.