http://www.dailymail.co.uk/news/article-3975032/Internet-mogul-wort...

"The installation saw a group of performance artists apparently remove a window on the 91st floor of the North Tower in 2000 with suction pads and replace it with a balcony where they stood, one by one and naked, at 6am on a March morning in 2000. 

It has eerie links to the atrocity which destroyed the towers, however. 

The first is the name given to it by its creators, the Vienna-based artists group Gelatin who referred to the project as 'The B-Thing'. The second is the scheduled date for an art show documenting the installation: September 11, 2001.

Gelatin was living in the World Trade Center on the 91st floor in the spring of 2000, occupying a shared studio space with other artists. According to the myth surrounding the installation, at 6am one March morning, they removed a window from the building with suction pads and replaced it with a box-like balcony. 

Each of the four artists then stood on the balcony naked, dismantling the piece 19 minutes later and without anyone, apart for those invited to view and film it from a helicopter, finding out. 

Harris was one of those invited on the helicopter, he says. An art show documenting the installation was scheduled for September 11 the following year before the deadly attacks.

Harrison claims he filmed Gelatin performing its World Trade Center installation in March 2000. He rented a hotel suite at the nearby Millennium Hilton, where they all celebrated afterwards, and that he captured it on camera in a rented helicopter, he said. 

A New York Times article about the project written in August 2001, a month before 9/11, referenced a book about it the balcony and included photographs purporting to show it.  

The book is still available for purchase on Amazon from $660. Skeptical internet users have described it as the 'smoking gun' for 9/11. "