Invisible Paris

I have been mulling over the notion of finding a way to stage Invisible Cities, a book by Italo Calvino and as a side step in my haphazard research came across this blog: Invisible Paris. One post there talks about a house smack dab in the 17th arrondissement with features that are not quite what they seem on the outside.
Here's the architect's model with a cross section of how the ground unexpectedly drops away, and how the house sits on top: Lime tree and all, this house is deceptively open, with much much hidden away.