The Louvre's famous giant glass pyramid, designed by Chinese-American architect I.M. Pei, became a landmark of the city of Paris in 1989- until it was made invisible by French street artist JR last week. The artist's installation is a trick of the eye, a gigantic paper photograph of the Louvre Museum covering the pyramid as part of JR's "artist takeover". Featured here on our blog, JR is well known for monumental black and white pastings covering buildings all over the world.