How much do you  trust engineers?

More to the point  --how much do you trust Pilkingtons  Glass? 
  

The balconies are  suspended 1,353 feet in the air and jut out four feet  from the building's

Skydeck.They are 4x10x10,made of solid  glass, floor  included...
   
  
 
   
 Formerly -  the Sears Tower
Not content with  having the tallest building in America, the  owners of Willis Tower

in Chicago have installed  four glass box viewing platforms which stick out  

of the building 103 floors  up.

Visitors get their first view  from The Ledge -- four glass balconies suspended from  the Tower.

Designers say the platforms -  collectively dubbed The Ledge - have been purposely  

created to make visitors feel as they are floating  above the city. The reward is

unobstructed views of  Chicago from the building's west side and a  heart-stopping

vista of the street and Chicago River  below - for those brave enough to look straight  down.

John Huston, one of the owners  of the Willis Tower, even admitted to getting 'a  little queasy'

when he ventured out on to the  balcony.However, after 30 or 40 trips, he seems to  

have gotten used to it..

Long way up: Even the  floor of the platforms are glass - few are brave  enough to look

straight down. Although some adults  felt dizzy after experiencing The Ledge,

children  seemed to take it in their stride.

Fearless: Five-year-old Anna  Kane spreads out on the floor of the 10ft square box  

which is 1,353 ft up.

Thrill seekers: The boxes jut  out four feet from the building and were specifically  designed

to attract visitors. The Willis Tower has  always been about superlatives - tallest, largest,  most iconic.

The Ledge is the world's  most awesome view, the world's most precipitous view,  the view

with the most wow in the world. The balconies  are 10ft high and 10ft wide, can hold five tons,

and  have glass which is 1.5 inch thick.

Inspiration came from the  hundreds of forehead prints visitors left behind on  

The Skydeck windows every week. Now, staff have a new  glass surface to clean: floors!

Architect Ross Wimer said: 'We  did studies that showed a 4' X 4' deep enclosure makes  you feel like you're detached from the building  particularly since there's only room for one row of  people.'

The Ledge is accessible from  The Skydeck which attracts 25,000 visitors on clear  days.

They each pay $15 to take an elevator ride up to  the 103rd floor of the 110-story office building that  opened in 1973.

After seeing this I think I  will just have a  seat in my sturdy,  favorite  chair.