"That’s not Photoshop. The Dutch artist Berndnaut Smilde has developed a way to create a small, perfect white cloud in the middle of a room. It requires meticulous planning: the temperature, humidity and lighting all have to be just so."
http://techland.time.com/2012/11/01/best-inventions-of-the-year-2012/#ixzz2EEqofiwg