The two Virtual Guides: Emperor Qianlong and a 17th century sister are projected at the entrance of the exhibition. The 3D technology brings the fully dressed Qianlong painted by Castiglione alive. He could greet visitors and stamp his Emperor's Seal towards the screen. The sister who represents European civilization could raise the cross and let the holy light shine. Each of the monitor would display a QR Code. Emperor Qianlong is the Chinese guide and the sister is the English guide. Visitors only need to scan the QR Code with his or her smart phone to obtain further information. This interactive guide let visitors have a taste of the exhibition before entering.