Unbelievably thin "house"

This is absolutely unreal.  See if you can find what's unusual about this picture:



See that sliver in between those buildings? Yeah, that's a proposed house.

Crazy, right? It's a proposed "house" designed by Jakub Szczęsny of Centrala for Isreali writer Etgar Keret.  It's been dubbed the Keret House  and will be somehow built between 2 existing structures in Wola, Poland.  If this isn't a record for "World's Thinnest House", I don't know what is.  Check out the interior below:

The stairs retract, and yes, that's a toilet.

More info and pictures here.