If you look at this building you can see the odd angle on one side of it along with the odd angles in the window frames showing how it follows the direction of the wall.
As there are steps leading up at the end, no cars may drive through this street although it is used for parking!
http://www.philippe-auguste.com/uk/
The Infamous Michael Osman
Here's his Discover Paris website where you may get in touch with him for a guided tour:
http://www.geocities.com/parisfinder/
He is worth at least 3 times what he charges!!