Espace Pur by Marc Hottinger & Lucien Iseli (MID-ECAL) is an air ionizer that uses dust as pixels and that displays patterns thanks to it, in a very slow motion way. It cleans and purifies the air in architectural spaces. It increases the level of oxygen's negative ions contained in the ambient air. Once installed, the air's oxygenation becomes nearly the same as in the mountains. The more there are negative ions, the more the air is purified.
Via variable environment.