Unique roofing

When i was about to come to Warsaw years ago, there is a building that caught my eyes on the internet while searching about the city. It has a very unique wavy roof. Well, i snapped some shots of the interior of the building :

It is a huge shopping mall called Zlota tarasy and on the topmost floor is where the food court, a gym and a cinema can be found.

This is the view from outside :