Pruned: Yellow Fog: "Yellow Fog
(Less sinister, at least we think so, than Artigas' vapor is Olafur Eliasson's Yellow Fog. In this permanent installation, fog rises up the sides of the Sammlung Verbund in the center of Vienna, Austria, shrouding it from street level to the roof. Fluorescent tubes embedded in the pavement emit a yellow light, which illuminates and substantiates something that's barely visible. Obviously related: Diller + Scofidio's Blur Building. Photo by Rupert Steiner.)
I think a lot more could be done with installations like this - displaying information using lasers in the fog; making the lights into LEDs that change to indicate things, and so forth. The world needs more glowing fog.