Berlin Wall Monument (Chicago) described the effects of the wall and its ultimate fall by arguing that "It became the landmark that symbolized the Cold War… the Berlin Wall also left a lasting impression on the psyche of the German people". She further argues that The Berlin Wall "provides a salient and powerful example of how material culture intersects with knowledge production in the psychological sciences". Since the fall of the Berlin Wall on 9 November 1989, fragments of the Berlin Wall have been donated to various cities in the world. Chicago was offered a piece of the wall in 2008 by the German
Berlin Wall Day. On 9 November 2009, Berlin celebrated the 20th Anniversary of the Fall of the Berlin Wall with a "Festival of Freedom" with dignitaries from around the world in attendance for an evening celebration around the Brandenburg Gate. A high point was when over 1,000 colourfully designed foam domino tiles, each over tall, that were stacked along the former route of the Wall in the city center were toppled in stages, converging in front of the Brandenburg Gate. A Berlin Twitter Wall was set up to allow Twitter users to post messages commemorating the 20th anniversary. The Chinese government quickly