C42 was designed by Manuelle Gautrand, and if you look at the front facade, I think her dream was to trap stunt kites in glass. She's succeed. Inside, Citroën's from throughout the company's history are sprinkled throughout the museum/advertising building.
C42 will open to the public tomorrow. If you can't make it to Paris, you can visit via pictures. One thing's for sure, Citroën knows how to hire a damn fine photographer. Just look at the pictures in the gallery.