The Villa “Le Lac” Le Corbusier (1923) is the fruit of ergonomic research and functionalist analysis—exceptional in 1923—aimed at achieving a typological standard: the narrow house with a single bay. That very standard was subsequently applied all over the world. Prototype of the minimal house offering a maximum of comfort and space, the Villa “Le Lac” crystallises ideas that would have considerable influence during the 20th century on the fundamental questions of the minimum living space and the dwelling for the greatest number. This modest 64-square-metre construction already brings together three of the future “five points of a new architecture”: the open floor plan, the roof garden and the ribbon window—one of the first in the history of architecture. A genuine technical experiment, this 11-metre-long horizontal window bears witness to a new concept of landscape framing and the relationship with the building site.