Perhaps Pei’s most famous work, The Louvre Museum is the world’s largest art museum. Pei designed the pyramid that was annexed onto the entrance of the museum (which was a former palace originally) and completed the structure in 1989. The pyramid was meant to allow natural light into the entrance which is a subterranean courtyard. At the time, plans for the pyramid were controversial among both the administration and the public. However, as evidenced today it is one of the most recognized and popular structures and represents Pei’s iconic use of both geometric shapes and use of materials. This is my favorite design of Pei’s and the glass makes it very beautiful, particularly against the surrounding cityscape.