The Villa Savoye incorporated these principles, and also realized many of the concepts expressed in Vers une Architecture. Made of reinforced concrete, the ground floor walls are recessed and painted green so that the house looks like a box floating on delicate pilotis. Visitors arrive by car, in true machine-age fashion. The stark white exterior wall, with its strips of ribbon windows, has a remarkably smooth, planar quality. This stands in contrast to the fluidity of the interior, which is organized by a multistory ramp that leads the viewer on a gently curving path through a building that is nearly square. The contrast between the sharp angles of the plan and the dynamism of the spaces inside charge the house with a subtle energy.