Experience hall introduction: One of the screens in the hall is constantly playing images of the crowd cheering when Nanjing was liberated. When visitors walk behind the screen, they will find themselves entering the cheering crowd. This is the latest blue screen keying technology. The camera behind the screen captures the images of tourists and then combines them into cheering images, creating this interesting effect. Therefore, this place has also become the most novel and interesting place for tourists and the most popular photo location.