The first building engineered predominantly from an artificial fog is the Blur Building designed by architects Diller + Scofidio for the Swiss National Exposition in Yverdon-Les-Bains, Switzerland, in 2002. A suspended 60 x 100 x 20 steel platform over Lake Neuchatel is permanently enclosed in a giant cloud. The highly precise water spraying is carried out by 31,400 high-pressure and high-grade steel jets with tiny apertures just 120 microns in diameter, through which lake water is forced at 80-bar pressure onto fine needlepoints and atomised into tiny droplets 4–10 microns across – small enough that most are suspended in the air as fog or "blur". The project cost $7.5 million. Up to 400 visitors can enter this fabricated fog, where they hear only the white noise of water nozzles, with computers precisely adjusting the spray strength according to the different climactic conditions. The fog mass constantly changes, producing long fog trails in high winds, rolling outwards at cooler temperatures, and moving up or down.In addition, visitors wear "brain coat" weather gear, which provides bodily protection and stores personality data for the building’s computer network. Using tracking and location technologies, each visitor's position is identified and their character profile compared to other visitors.