Two visitors stand behind the Angry Birds cut-out boards at Window of the World Park in Changsha on Sep 1, 2011.The realistic version of Angry Birds recently landed at the Window of the World Park in Changsha, Hunan province. Transforming the game from virtual to reality, visitors can launch tangible angry birds into evil green pigs. An industry insider said that the theme park might inspire new marketing strategies for video game developers. [Photo/CFP]