From afar, it looks like little more than a strangely earthbound cloud. But get a little closer and you realize that it’s actually a building shrouded in man-made fog. The Blur Building in Switzerland is a suspended platform that sprays tiny drops of lake water into the air from 31,400 jets, creating the mist effect.

http://weburbanist.com/2010/04/19/15-bizarre-buildings-around-the-world/