The document discusses the ESP Game created by Luis von Ahn of Carnegie Mellon University. The game involves two anonymous online players who try to label images by guessing the same words without communicating. It has successfully labeled millions of images and could label all images on the web within 30 days by engaging enough players. The game provides a fun way to reuse human effort for tasks like image labeling while also giving players a strange sense of intimacy with their anonymous partner.