Ieoh Ming Pei, better known as I. M. Pei, is a Pritzker Prize-winning Chinese-American architect whose buildings can be seen the world over. In his works, structure and environment are carefully integrated with precise geometric design to create crisp, clear, sculptural edifices. He is known for his sensuous use of materials like marble, concrete, and especially glass—which he used in his pioneering all-glass curtain walls. What controversial Parisian structure did Pei design in the 1980s? Discuss