New Scientist is carrying this story about a new application of a concept called "augmented reality". Instead of completely replacing the "world", as happens in virtual reality, augmented reality instead imposes virtual stuff on what is otherwise the real world. While the subject of the article is the creation of a life-sized human-powered version of the classic arcade game "Pac Man", there are more pratical applications. The article specifically mentions medical and military use; Aviation Week has also mentioned the technology in relation to making civil aviation simpler, safer, and easier.