Architecture is a way to define space, indeed buildings create boundaries between private and public for instance. This building in Avenue Georgette in Lausanne is a great example of such separation.
As a matter of fact, in this building public and private spaces are completely juxtaposed without breaking the overall unity. However, those different spaces are clearly marked on the facade where multiple elements define each space.
When Avenue Georgette showed the difference between private and public, Avenue de Sebastopol in Paris is a great example of the opposition between the layers of the city. Indeed, on the surface life thrives but quite unexpectedly it's underground that the city is the most lively.