The problem: Sears needed office space for its many employees in Chicago. The solution: an innnovative design by structural engineer Fazlur Khan, a Bengladeshi-American, where nine tubes cluster together to create a super-strong skyscraper. Known as the Sears Tower and now renamed the Willis Tower, this building is the tallest in the United States.
The creation of the Sears Tower led to other buildings that used the tubular design, such as the Citigroup Center. Advantages of this design included more window space and the use of less steel. For an image of the Sears Tower, you can see http://en.wikipedia.org/wiki/Fazlur_Khan.
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