The narrow lot is developed with maximum cubature and utilization: on the very top, the living space with a view of the Rhine valley and the Drei Schwestern mountain range. The sleeping quarters are retracted, cross-shaped, reduced to the private spaces. The ground floor, open, resting on pillars, is entrance, terrace, and garden in one. Far below the ground is the wine cellar. All floors have a different ground plan. The stairway, a double helix, distinguishes for guests, the accessible spaces from the private ones.