Iclandic artist Olafur Eliasson created a piece in 1998 for the Jewish Museum in New York titled Yellow Fog, pictured above. It’s both lovely and creepy as fog is emmitted through grates in the ground at the base of the building at dusk on timed intervals for an hour. Yellow light shines through the fog as it lifts upward from the street. This is a wonderfully surprising piece that would be perfect on a Halloween night. Currently it resides in the center of Vienna courtesy of Sammlung Verbund where it became a permanent installation in 2008, pictured below.

images via Olafur Eliasson