2. The louver pyramid (le grand louver)
•the pyramid in the main courtyard of the louver palace in paris.
Is a large glass and metal pyramid surrounded by three smaller pyramids,it consists of 603 rhombus and 70 triangular glass segments .
•The larger pyramid serves as the main entrance to the louver museum, while entering it has a large lobby space which leads to the other museum spaces ,the building over all shows complex geometric designs inside and out.

3 the hong kong bank
•was the tallest building in Asia and still remains one of the tallest in Hong Kong.
•the tower emerges from a 52-meter cube and reduces its mass, quadrant by quadrant, until a single triangular prism resides.
•The faceted prism is clad in reflective glass that mirrors the changing sky
•The bamboo plant was also a significant inspiration for this unique building. The trunk of this massive structure is representative of the growth patterns of bamboo, the symbol of hope and revitalization in the Chinese culture.

4 The national gallery of art east building in Washington DC
•One of pei's masterpieces , giving the public a show piece glass ceiling and walls that came to a fine edge as sharp as a blade the building has been thoughtfully laid out to provide a walking chronology of art works.