. The game asks two randomly paired people (on different computers) to describe the same image without any way to communicate. Within a time limit, the players must predict the same word for an image before moving onto another image.
Normally, companies like Google or Yahoo would need to hire people to label the millions of images in their archives. But with only 5,000 people playing the ESP Game simultaneously, they could label all of Google's image archive within two months, he said. That must be why Google licensed the ESP Game from von Ahn and Carnegie Mellon University in 2006 to label its images.
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