Here is a description from 'art league press':
Havel and Ruck will create a large funnel-like vortex beginning from the west wall adjacent to Montrose Blvd. The exterior skin of the houses will be peeled off and used to create the narrowing spiral as it progresses eastward through the small central hallway connecting the two buildings and exiting through a small hole into an adjacent courtyard.
all pics via this site. the project was originally seen on io9 a couple of months back.