This made my head hurt

Today I came across this amazingly talented and creative photographer. His name is Romain Laurent and he is from France.
As I looked through the pictures on his website I came across his series called "tilt". 
Each picture basically shows a model that stands somewhat upright in front of a tilted background with the position of her feet and everything totally in place.
Looking at these pictures really made my head hurt as I was trying to figure out HOW in the world he did that.
And I bent my head and checked out feet, dresses, shadows and it just made sense.
I really was close to getting up to see whether I could stand skew like that. I guess that would be something you´d really like to see, right?? :D 
Aaaaanyway, I couldn´t just settle with not knowing how he created the pictures so I started searching google.
It didn´t take me long to find what I was looking for.

Here is an example of one of his pictures:

 Picture by Romain Laurent.

You can check out the whole series HERE.

And THIS is the link to the article in which his post processing tips and tricks are revealed.

Now I will go lean against a wall... :D