When commissioned to design the Bank of China Tower, I.M. Pei wanted to create a structure that would represent the aspirations of the Chinese people yet also symbolize good will toward the British Colony. Original plans included an X-shaped cross brace. However, in China the X-shape is seen as a symbol of death. Instead, Pei opted to use less threatening diamond forms. Another symbol used for this building is that of the bamboo plant, which represents revitalization and hope. The sectioned trunk of the Bank of China Tower is inspired by the growth patterns of bamboo. The four triangular shafts which form the building grow more narrow as the building rises. These shafts support the weight of the building and eliminate the need for many internal vertical supports. Consequently, the building uses less steel than typical for a building its size (text from architecture.about.com).