It appears that these two artists created a house artwork, where they built a real tunnel through an old house that had been used for years as an art gallery.
The artists used the wood from the exterior of the house to build the vortex...way to go with that recycling effort!
Although only a temporary project (a new building was going to be built on that same space) what a great way to make people look and think in a new way about the built environment.
Kudos to artists Dan Havel and Dean Ruck!