Projectors

​Imagine if you were a spy who needed to receive secret messages while you walked around a crowded room, but you didn't want to wear an earpiece. Well, a cheap new device could help. It's billed as being "the first sound projector that can track a moving individual."

The centerpiece of the Chinese Pavilion at Expo 2010 in Shanghai is a stunning animated digital tapestry that takes one of China’s most famous paintings and updates it for the 21st Century.