lol very cool video..
The Sears/Willis tower has a glass floor now too..for the people who might want to feel safer....
Skidmore, Owings and Merrill, the architecture firm that designed the tower, also designed The Ledge, whose four 1-1/2-inch-thick glass boxes are being placed on the building's west side, according to the fact sheet. The retractable boxes will extend 4.3 feet out from the side of the building at 1,353 feet above street level, according to the fact sheet.
Each of the four Ledge boxes is comprised of three layers of half-inch-thick glass. They are designed to hold about five tons, much more weight than they are expected to have to carry when they have a full group of visitors, and also higher than the two tons required by city code, according to the spokeswoman.